missing and backfires

1988 CHEVROLET TRUCK
70,000 MILES • V8 • 4WD • AUTOMATIC
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JOHNM1973
  • MEMBER
  • 1 POST
truck was running great. Then it started missing and backfiring. I thought I got some water in the fuel line or injectors were dirty. We added injector cleaner and dry gas. Good for a bit then started again. We replaced plugs, wires, distributor and rotor, oxygen sensor. Idles great, motor sounds fine still stutters and acts up when you accelerate or go up hills. HELP
Dec 29, 2008 at 7:19 AM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
Sounds like you still have water or fuel contamination issue. However, here is a guide that will help with getting us started:

https://www.2carpros.com/articles/engine-backfires-while-running

What I would suggest is we start with draining the fuel tank and then adding another bottle of injector cleaner or seafoam with known clean fuel.

Then change the fuel filter which I attached the process below.

Here is a guide that will help with this as well:

https://www.2carpros.com/articles/how-to-change-a-fuel-filter

If this does not help, then we are going to have to check the compression. Here is a guide for this issue:

https://www.2carpros.com/articles/how-to-test-engine-compression

Please see the info below for the filter and let us know what you find. Thanks
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Nov 13, 2021 at 1:05 AM
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