My 2006 Nissan Altima started skipping or a slight buck today and has off and off for a few weeks, but today when it did that, the engine light came on. The mechanic checked it and said it was the crank shaft sensor and the speed sensor. We have had no trouble with starting the car and it hasn't just stopped while driving for no reason. He said it might just be a fluke. It has been skipping or slightly bucking though. What could it be?

High sulphur fuel and in need of an engine tune. Very common problem in Australia.

Classic engine miss. The cause might be a faulty injector, or more likely an issue with ignition. Start it at night in the dark and look for arcing- that is the area to start. Plug wires and ignition components.

97 Ford T-Bird V6 3.8 Skips at Ideal and bucks going down road Come to stop sheckes real bad rough Ideal in gear.

IF ITS NOT THE INTAKE MANIFOLD GASKET .THE OIL GOT ME PUZZLE ,ANY RATTLING NOISE?IT SOUNDS LIKE THE TIMING BELT. GOOD LUCK

you car computer needs to be checked. if the altenator was put in without unhooking the battery this could have fried your computer. for futher help and assistance please call 419 689 1114 for futher assistance i will be more then happy to help

Sounds like it could be a vacuum problem somewhere in the system, which when you reach a certain speed (or any depending on the leak) the computer feeds the engine more or less gasoline, making the engine stall.
There's a few other problems that could be causing this as well. Bad fuel mixture (bad gas), there could be a crack in the fuel line, which is letting in air thus causing the fuel pump to lose its prime.
Do you receive any error codes/any 'check engine' lights?

the 2.5 altima's had a recall on that problem about 2-3 years ago. Go to edmunds or progressive find the recall letter and the dealer will fix it free. well here you go:

Recall ID # 07V527000 - ENGINE AND ENGINE COOLING Recall Date: NOV 14, 2007 Component: ENGINE AND ENGINE COOLING Model Affected: ALTIMA Potential Units Affected: 653910 Recall Details Recall Date: NOV 14, 2007

Model Affected: 2005 NISSAN ALTIMA

Summary: ON CERTAIN PASSENGER VEHICLES EQUIPPED WITH A 2.5L ENGINE, THE CRANKSHAFT POSITION SENSOR CAN OVERHEAT CAUSING A BRIEF INTERRUPTION IN THE SIGNAL OUTPUT FROM THE SENSOR.

Consequence: IF THE INTERRUPTION IN THE SIGNAL FROM THE CRANKSHAFT POSITION SENSOR IS SO BRIEF THAT THE ELECTRONIC CONTROL MODULE (ECM) LOGIC DOES NOT HAVE TIME TO DIAGNOSE THE CONDITION, THE ENGINE MAY STOP RUNNING WITHOUT WARNING WHILE THE VEHICLE IS DRIVEN AT A LOW SPEED INCREASING THE RISK OF A CRASH.

Remedy: DEALERS WILL REPROGRAM THE ECM FREE OF CHARGE. CERTAIN MY 2006 ALTIMAS WHICH HAVE BEEN PREVIOUSLY REMEDIED UNDER RECALL CAMPAIGN 06V223 (NISSAN R0606) ARE NOT INCLUDED IN THIS RECALL SINCE THE REPROGRAMMING FOR 06V223 ALSO INCLUDED THIS REPROGRAMMING. THE RECALL BEGAN ON DECEMBER 31, 2007. OWNERS MAY CONTACT NISSAN AT 1-800-647-7261.

Potential Units Affected: 653910

Notes: NISSAN NORTH AMERICA, INC.

Plug out all the sensors at the bottom where you sprayed it down and blow out all the plugs on the inside

Here are the Recalls for your Model Car. Nissan Altima Recalls Recall ID # 07E087000 - EXTERIOR LIGHTING:HEADLIGHTS Recall Date: OCT 25, 2007 Component: EXTERIOR LIGHTING:HEADLIGHTS Model Affected: ALTIMA Units Affected: 4654 Recall Details Recall Date:OCT 25, 2007

Model Affected:2006 NISSAN ALTIMA

Summary:CERTAIN TYC HALOGEN TYPE HEADLAMP ASSEMBLIES P/N 20-6644-00 SOLD AS AFTERMARKET EQUIPMENT FOR 2005-2006 NISSAN ALTIMA PASSENGER VEHICLES. THE PHOTOMETRIC WERE MISALIGNED WHICH DOES NOT COMPLY WITH FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT.

Consequence:MISALIGNMENT OF THE LIGHTS DIMINISHES FRONTAL ILLUMINATION WHICH COULD RESULT IN A VEHICLE CRASH.

Remedy:GENERA WILL NOTIFY OWNERS AND OFFER TO REPURCHASE THE NONCOMPLIANT LAMPS. THE RECALL BEGAN ON OCTOBER 25, 2007. OWNERS CAN CONTACT GENERA AT 714-522-6688.

Units Affected:4654

Notes:GENERA CORPORATION Recall ID # 06V223000 - ENGINE AND ENGINE COOLING Recall Date: JUN 21, 2006 Component: ENGINE AND ENGINE COOLING Model Affected: ALTIMA Units Affected: 85000 Recall Details Recall Date:JUN 21, 2006

Model Affected:2006 NISSAN ALTIMA

Summary:CERTAIN PASSENGER VEHICLES EQUIPPED WITH 2.5L ENGINES MAY EXPERIENCE EXCESSIVE ENGINE OIL CONSUMPTION AS A RESULT OF IMPROPER PERFORMANCE OF THE PISTON RINGS.

Consequence:IF THE OIL IS NOT MAINTAINED AT LEAST AT THE MINIMUM LEVEL, ENGINE DAMAGE CAN OCCUR AND IN EXTREME CASES RESULT IN AN ENGINE FIRE.

Remedy:DEALERS WILL REPROGRAM THE ELECTRONIC CONTROL MODULE (ECM OR ENGINE COMPUTER). YOUR VEHICLE WILL ALSO BE INSPECTED TO DETERMINE IF IT HAS BEEN CONSUMING ENGINE OIL AT A HIGHER THAN NORMAL RATE. IN A SMALL PERCENTAGE OF VEHICLES, ENGINE REPLACEMENT WILL BE NEEDED. ON JUNE 9, 2006, NISSAN NOTIFIED OWNERS OF THE POSSIBILITY OF EXCESSIVE OIL CONSUMPTION AND THE IMPORTANCE OF MAINTAINING THE OIL AT A PROPER LEVEL. FOLLOW-UP LETTER TO OWNERS ADVISING THEM OF THE STATUS OF THE RECALL WAS SENT DURING AUGUST 2006. FOLLOWUP LETTER TO OWNERS WAS SENT ON NOVEMBER 15, 2006. OWNERS MAY CONTACT NISSAN AT 1-800-647-7261.

Units Affected:85000

Notes:NISSAN NORTH AMERICA, INC. Recall ID # 06V046000 - SUSPENSION:REAR Recall Date: FEB 13, 2006 Component: SUSPENSION:REAR Model Affected: ALTIMA Units Affected: 759 Recall Details Recall Date:FEB 13, 2006

Model Affected:2006 NISSAN ALTIMA

Summary:ON CERTAIN VEHICLES, THE REAR SUBFRAME MAY HAVE BEEN MANUFACTURED INCORRECTLY, WHICH COULD RESULT IN A CRACK IN A BRACKET WHICH HOLDS PART OF THE REAR SUSPENSION.

Consequence:IF THE BRACKET IS CRACKED, THE STABILITY OF THE VEHICLE MAY BE AFFECTED UNDER SEVERE DRIVING CONDITIONS. THIS COULD LEAD TO A LOSS OF CONTROL OF THE VEHICLE WHICH COULD RESULT IN A CRASH.

Remedy:DEALERS WILL INSPECT THE REAR SUBFRAME TO DETERMINE IF IT WAS MANUFACTURED INCORRECTLY AND REPLACE IT, IF NECESSARY. THE RECALL BEGAN ON FEBRUARY 27, 2006. OWNERS MAY CONTACT NISSAN AT 1-800-647-7261.

Units Affected:759

Notes:NISSAN NORTH AMERICA, INC. PB016 Recall ID # 07V527000 - ENGINE AND ENGINE COOLING Recall Date: NOV 14, 2007 Component: ENGINE AND ENGINE COOLING Model Affected: ALTIMA Units Affected: 653910 Recall Details

Most likely cam and or crank sensors. Have it scanned to be sure.