Ideling rough The car lacks acceleration and when coming to a stop shakes badly - ideas I've heard; water in fuel, bad gas, cracked intake manifold... what do you think?

ZULFIQARDR HAS A TOYOTA CAMRY CAR, SOUND LIKE ROUGH IDLING COULD BE CAUSED BY WEAK FUEL PUMP,DIRTY FUEL INJECTORS, FOUL OUT SPARK PLUGS CAUSED BY LEAKING FUEL INJECTORS,LOW IDLE SPEED, CHECK IDLE SPEED CONTROL COULD BE TOO LOW ARE FAULTY LOOK FOR VACUUM LEAKS ON INTAKE MANIFOLD.BAD LEAKING ENGINE VALVES.

V6? does it get any better when it warms up? Does RPM rev hi to low or does it sit at one speed and shakes? Hows the plugs? first thing first, buy a can of carb/choke cleaner $ 5.00 . Remove any plastic motor cover plates that would expose the motor. Spray cleaner around the base of the intake manifold and all mating areas of the intake manifold. ( not into the air intake) does the motor rpm change or rev up? if yes, you have bad intake gasket. also spray and check all air (vacuum) hose connections for proper fit and no cracks. Check plugs and note color and condition of each and what cylinder it was from, a brown paper bag color is normal, a super clean look is lean possible coolant leak, a burnt or melted electrode is early detonation timing, oil carbon deposit bad rings or valve guides,seals, wet is to rich , air fuel mix. Several things cause this, check all seals,air lines first,air filter, cracked or split intake tube, gasket check, does it run rough at cold idle only ( possible temp sensor ) you can check alot of things to eliminate without spending cash,

You may need to check the engine timing, that would be the first thing,, 4.3 is also bad about leakes in the fuel lines that are under the intake manifold. this is part of the fuel injection system, it will cause it to rough idle, but will accelerate fine, but when come to stop, will have a rough idle.

IF CHECK ENGINE LIGHT NOT COMING ON.YOU COULD HAVE WATER IN FUEL.INTAKE MANIFOLD VACUUM OR VACUUM HOSE LEAK.MISFIRE DUE TO BAD PLUGS AND WIRES.ONE OR MORE FUEL INJECTORS STOP UP.

A lack of power or a vehicle running rough can caused the vehicle to "shake" and also a broken motor mount or transmission mount can cause the problem.
If it's running rough it could be because of one of two fairly common problems. One is a leak in the air duct between the air filter and the throttle body. The other is a leak from rubber hoses connecting the intake to the PCV valve at the crankcase causing a vacuum leak. More serious problems such as a misfire from a bad coil pack or a blown head gasket can also cause the vehicle to lose power and run poorly but these are not as common.

WEAK FUEL PUMP OR STOP UP FUEL FILTER.RESTRICTED EXHAUST LIKE STOPPED UP MUFFLER OR CATALYTIC CONVERTER.LOW ENGINE COMPRESSION.VACUUM LEAKS IN THE INTAKE MANIFOLD.BAD PLUGS.WEAK SPARK OR IGNITION .

Hi: What Color is the Oil coming out of your Tail Pipe? I'm Assuming its Motor oil and not Transmission Oil.Since you found white looking substance in your oil It sounds like you have a Blown Head Gasket or both.And could be a Crank Block or Head ,Pull your Spark Plugs out, And Have someone Crank engine over and see if you are getting that white Substance Which i assume is Motor Oil.If you are getting ANY out of ANY Spark Plug hole then Is fair To Say you have a Blown Or Cracked Head Gasket.THERES only 1 Other Alternative On Older Vehicles than Yours is ,They Had what was Called a Vacum Modulator That Attached to the Auto Transmission, I worked off of Vacum From The Intake Manifold,And if the Diafram in It went Bad it would **** Transmission Fluid up Through the Intake Manifold and Burn It through your Intake and would come out tail Pipe as a WHITE SMOKE,But it normally would not be in the Enging Oil Or Radiator.So i Would 1st Check the 1st Advise i have Given You.Pull The Spark Plugs. Hope This Helps.Please REply by Voting if this Helped Youat All,Thanks From the WYOCWBOY

sounds more like a air control /sensor but its difficult to diagnose from spain without seeing the car ,sorry for being able to give a quick fix

Bad EGR valve comes to mind here. Assuming the plugs are good, the EGR valve woiuld be what I'd look at.

Just trowing some suggestions out there, but, I would check the idle air control valve (solenoid) or the throttle position sensor. If they check out then my last guess would be the map sensor or the vaccuum to the map sensor. Hope I was able to help. Best wishes.