Hello, i had a Tune Up from Hell,#1 Mech.installed NewAutolite plugs," Standard " Brand wires,PVC Valve,Fuel filter on pass.side, Timed car, Results;hesitation, stutter type acceleration, hell i thought my tranny was slipping.that's the way the car ran.#1 mech has no diagnose equip. im screwed.i go to # 2 mech.9ys.shop owner,4 stalls, three ASE cert. Mech. very busy guy,high end cars, older cars,fleet service,he does a Hands on diagnose,Spray for vacume leaks,none.checks timing with gun,OK.checks firing order,OK. checks distributor cap & finds loose connection pin, also finds two spark wires "Leaking" One wire sparks to the a-c bracket, & one sparks to the alternator ,a blue light.& one spark plug that has a small crack where ceramic base meets metal. New Wires & cap & new plug are installed.A C Delco. Results: 'Car runs Worse. BAD Idle, & for every piston stroke there is a puff of Black smoke out of the tail pipe.This is a one owner car.Always ran smooth. the motor is 7 yrs old with 56.000 mi. Never had this type of problem before. Can not even go past 10 mph. runs very bad. I am going back to see #2 mech. in morning, any ideas?

would certainly change those also

Do a quick check. Run a wire passed everything from the battery positive terminal to the power connector on the pump, or if you cant get to the pump directly then the first connection you can make to the pump's power supply wire. If she fires up then its a bad fuse, faulty relay or something electronic not putting the power through. If she still refuses to fire it could be the fuel filter filter (to lean), leaking fuel regulator or leaking injectors (too rich). the regulator has a vacuum line on it. If there is a leak in the regulator then fuel vapour is carried by the vacuum line and enriches the air in the intake manifold. The fuel pump has to deliver about 40 - 50 pounds of pressure to the fuel line and has to keep about 90% of that pressure for about 5 minutes after it has been switched off. Dropping pressure indicates poor valves on the pump or leaking injectors. It is not enough that the pump is effective the fuel line should be capable of filling a pint pot in about 15 seconds. If the pump has good pressure (and retention when off) but poor flow then the filter is clogged (this will also kill the pump eventually). As a final check make sure the idle air control valve on the throttle body is clean and functioning as it should.

Hello there:
This could be the result of several things
which could be the following
(1). the fuel filter is clogged and needs to be changed
(2). the fuel pump is starting to fail.
(3) there is a vacume leak somewhere in the system.
(4). the fuel system is dirty and needs to be cleaned
(5). the pvc or ekg valves are clogged or not working properly. and sensors
(6) the vehical is needing a full tune up (plugs and wires and distributer cap and air filter ect ect
along with having the timing reset.
(7). bad fuel or water in the fuel .
these are the most common problems that you will find
ok hope this is very helpful for you
Best regards Michael

when you do a tune up check all engine fluids check the cooling system.inspect and test battery.check all underhood hoses. check and adjust the drive belt.check the air filter.check pvc valve. replace the spark plug wires.replace spark plugs.replace air filter. replace fuel filter.check the fuel system.check the ignition timing.check the charging system.and check the egr valve.

Tune Time.
1)new spark plugs properly gapped.
2)new air filter (check every 35000 miles)
3)new fuel filter (every 35000 miles)
4)1 bottle of STP fuel treatment (red bottle) 4x a year.
5) oil and filter change (castrol or another good quality oil every 3-4000 miles.
6)proper air pressure in tires (check every 2 months
7) service transmission every 40000 miles or less.

New oil and filter
8) new plug wires every 80000 miles.

You need spark plugs,and wires(or boots) and fuel filter,and air filter,and a pcv valve wouldn`t hurt either.

Needed are: 1. spark plugs NGK6962 2. spark plug wires NGK8120 3. oil 5W-30 4.2 liters with filter 4. oil filter 5. fuel filter 6. PVC valve 7. throttle body cleaner 8. Grease gun, ( Use Marine Grease ) It cost more but last longer 9. Front, rear, transfer case. 80W-90 10. Antifreeze and thermostat 5.5 liter

Your IAC may be defective, first check the canister purge valve by removing the large hose off the charcoal canster and plugging the hose with a bolt or something you can fit into it, then try it also check PCV valve and see if it's bad. there are more things to check like fuel filter fuel pump and or fuel strainer if fuel tank but would need to have more information to help.

have you unplugged a connector somewhere ,possible without knowing it ,like the pick up sensor when you changed the oil?? go back and check everything its got to be something stupid

start with simple thing like a tune up change fuel filter, air filter and plugs pvc valve ect. but if you can't afford just change your fuel filter. hope this help buddy