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I received a tune up and now my car runs badly, already checked the firing order

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First and foremost, make sure Denso or NGK plugs were used. Firing order will be fine as it is a coil on plug design. Perhaps a plug was dropped, and the porcelain is cracked, or the plugs were not properly gapped.

Posted on Nov 09, 2010


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My husband did a tune up on my car yesterday and now it wont start it will turn over like it wants to start but it wont he said that its miss firing we have bought 3 new coil packs and still will not start...

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Number 4 cylinder misfiring. i already did a tune

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1988 chevy 3500 runs really bad!

I have the same truck I've been looking for information on a different subject. I am an ASE technician I may know what might be causing your problem. First off the white wire on the coil that goes to nothing is your test wire it's not going to be hooked up unless you are performing a test to ensure that the coil is working. Just changing parts often times does not solve the problem and it can become very expensive and make things worst for the next guy to fix. it's going to be in one of two systems Fuel or Ignition since you just did things to the ignition system I'd start looking there check the firing order needs to know what engine you have before I can give you the firing order. is this a V6? V8 5.7? what all did you replace during your tune up? it could be that one of the plugs are not gaped correctly or tightened down which could cause damage to the head requiring the valves to ground to correct the problem. Your catalytic converter may also be causing the problem one the et hot and melt they start blocking the flow of exhaust. If you would like to read more on that check out this site it has some very good information.

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