My 95 had the same problem as the original problem on this thread. Chugging and backfiring. New plugs and wires fixed it. Sad part is I had new plugs put in a couple of months prior when I had a starter replaced. I wish I had returned to the dealer when I noticed the first hint of a miss becasue the real culprit was a craked spark plug that had to have been craked when installed. When I complained to the service manager about it he discounted the repair by giving me 1 new plug!
I feel my car has fallen in love with the mechanic because today it in for a FPR and filter along with a new neutral switch, since when it would die due to lack of fuel you had to stop and put it in PARK. Kinda dangerous. I do hope the FRP and filter do the job because of course the fuel pump will be next. I will probably try that one myself. I do hate to have the dealer do the work becasue of the expense, but throwing parts at a problem can be expensive too.
The folks on this are very very helpful.
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Originally Posted by RobertHammen
Yes, its' possible that, if your car was run with really bad wires for a prolonged time, that one or more of the coil packs has gone bad. Suggest you get one replacement, mark it, install it, then try the car. If it still hesitates/stumbles, then swap it for the next one down the line and see if it makes a difference, et. al. Of course if more than one is bad...
Also may not be a bad idea to clean the throttle body (do NOT use carb cleaner, there is specialty throttle body cleaner available at any auto parts store for around $2/can) as well as the Idle Air valve. If both are carboned, this can be a problem.
Either GM injectorguard or Chevron Techron fuel system cleaner may not be a bad move, either. You did change the fuel filter, right?
Here's a tip for the FPR install... put a little oil around the small o-ring on the bottom, before twisting in the FPR. I had problems with my replacement FPR, which turned out that some idiot had put the wrong size O-ring on the FPR, causing it to tear/not to seal when the FPR was installed. This led to hard-start conditions (cranking for 4-5 seconds). I was able to buy a FPR parts kit for $9 and it was apparent to me when I put the new one on, that the one that came with the replacement FPR was about 2 sizes too big. The replacement one seemed bigger than the one that was on the car, but I attributed that to the original one being compressed from being in the car for 6+ years...
Hope this helps,
--Robert
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