Car bucks when gas pedal in pushed

Question edited for clarity.
Question moved to make and model category.

That is a lot of guessed parts!

Clean the Throttle Body and MAF.

Problems with the o2 sensors or the Catalytic Converter would trigger the Engine Malfunction Light to come on, as would many of the parts you swapped out. Diagnose and then fix. Find an auto electrician with a pro grade scan tool computer. That can diagnose the fault and be recorded as it is happening on a drive.

https://www.google.com/search?q=auto+electrician+near+me

..

Hello,

Assuming your spark plug firing order is correct after the coil pack replacement and your plugs and plug wires are clean and connected properly--and you have gas in the vehicle--I am thinking Throttle Position Sensor (TPS).
To test the TPS you hold the throttle pedal to the floor and start the vehicle, if the vehicle starts you need to clean or replace the TPS.

If the vehicle will still not start and everything was replaced on the vehicle as the parts came off of the vehicle--and the vehicle ran before think:
Compression: Washed cylinders (pull plugs and squirt clean oil in spark plug holes (one-two squirts).
Fuel: pull hose after fuel filter and crank vehicle
Spark: Pull plug wire and arc with screw driver when cranking engine. New coil pack could be faulty.

You may need someone to crank the vehicle (mind your hands) while you test. You should be able to find videos for spark testing.

I hope this helps.

check there are not any splits in your air intake hoses and check the ignition timing is good.

Check your cable from gas pedal to throttle body or injection area.

have you tried holding the gas pedal down a little to see if it starts that way,if it starts then your throttle body/ IAC is dirty,if that didnt work, check for fuel pressure if you dont have a pressure guage you can un-clip the fuel line at the eng have a small plastic jug to catch the gas and have someone just turn the key to run ( not cranking it over) and see if a shot of fuel comes out of the fuel line,then have them crank it over and see how much gas comes out-if nothing or very little then you may have a plugged fuel filter or bad pump,or a bad fuel pump relay-if gas comes out,then it could be cam sensor or a crank sensor problem,assuming every thing else is good-you didnt say if the coil pack was new or used,or if you checked for spark,but a scan tool would give you a code for either the cam or the crank sensor or any other relavent code.A bad PCM will also stop the spark and the fuel,I hope this is helpfull

You need spark plugs,the champion on piece ones
in the motor (were talking 5.4 V8 here)
Can't have plugs in there older than 3 years

You need front oxygen sensors replaced at 100,000 miles

You most likely have several failed COP Ignition Coils, that
give you throttle body codes (the problem IS the coils NOT
the tps sensor or TACM on throttle body-just replace the
coils yourself (Rock Auto.Com for parts)

Clean the MAF Sensor (CRC MAF Cleaner)
New air filter

Your vehicle has electronic throttle control .Position sensors in the gas pedal an throttle postion sensors at the throttle body tell the PCM/ECM -engine computer , how much your foot is pushing on the gas pedal an where the throttle plate is located . These postion sensors wear an can cause this problem ! I suggest you take your vehicle to a qualified repair shop an have it diagnosed .

check plug wires and coil all spark in all plugs should be blue spark no orange spark if any orange replace coil i have a 2003 explorer so i know if that dont sove anything try a crankshaft postion sensor and or cam postion sensor as they tell cars ecu when to fire spark and what cylider to fire it to lmk what happens we can go from there


if it helps i would love a thumb up review

likely fuel pump, dirty MAF sesnor or distributor CMP sensor going. go here

http://groups.yahoo.com/group/villagerquest/

when my 96 nissan maxima gets hot it will cut out and almost like buck like it dose not get enough gas. i have chaged all filters and plugs and coil pack