Engine missing or pinging

Tiny
KENNETHMASON
  • 1992 CHEVROLET CHEYENNE

I have a 5.7 liter. I am having problems with the engine missing at a certain rpm. Just before shifting to next gear it will start missing. And also misses in between acceleration and deceleration level. When I mess around with the vacuum it straightens out for about 20 miles and goes back to square one. Hope you can help.

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Wednesday, October 3rd, 2012 AT 10:03 PM

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Tiny
HMAC300
  • EXPERT
  • 45,722 POSTS

Check to see if the gasket below the tbi unit is leaking. Spray choke cleaner there and if rpm changes you found the problem. They have a habit of breaking under the tbi. Also check your pcv and map sensor hoses as they get soft and suck together. You might try scanning for codes as well, you can go to trouble codes on site here andlook under obd1

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Wednesday, October 3rd, 2012 AT 10:17 PM

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