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Poor Acceleration, shaky idle when cold. spark plugs??

HI!!! ok, ive been having this issue, where when i accelerate, it doesn't want to. like it hesitates until it reaches about 30 then its fine again. i figured it needed a new fuel filter, so i changed it and a serpentine belt and when i took it for a run around the block the problem got worst. it really chokes now like something isnt supplying enough of something to it to pick up, this a 5.0L V8 here, this shouldn't have an issue getting up and going. i need to solve this problem i cant drive now cause it inches along until 25ish even with the foot to the floor. also when i start the car ever since i got it when its cold its shaky and sometimes shuts off on me, when it warms up tho, its just fine the rest of the day. is it spark plugs? the car has 81,000 miles on it never raced or abused. and this issue just presented itself id say about 2 months ago and when i tried to fix it it got way worst. i need help or insight cause im stuck right now, i read up it may be spark plugs if there too old. or the wires. i dont know. thank you !!!!

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  • Cars & Trucks Master
  • 3,904 Answers

If you have never had a tune up you are most certainly ready for it. Plugs wires and distribution. That still may not be your total problem here. It sounds like you are not getting gas to it so I would check the fuel injectors as well as the air filter.

Posted on Jan 21, 2013

  • jimmy plague Jan 21, 2013

    air filter is new, replaced it wen i got the car. new fuel filter as well. car is 31 years old no history of when plug and wires were maintained. took it for a spin today, its not doing it anymore. i dont trust it.

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SOURCE: 1996 Chevy Express 1500 w/5.0 bogging only when warm.

The cylinder 7 misfire is likely a symptom of the problem, not the problem itself.

Typically, the catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream 02 sensor reading should be fairly steady. Typically the P0420 code triggers the check engine light if the readings of the two sensors are similar. This is indicative of (among other things - such as faulty sensors in the "emissions loop") a converter that is not working as efficiently as it should be.

I do not believe that it is a problem with a valve/head gasket or cam.

Posted on Jan 13, 2009

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