Misfiring on cylinders two, three and seven

Tiny
KAT OWENSBY
  • MEMBER
  • 1986 CHEVROLET VAN
  • 100,000 MILES
Was misfiring on cylinders two, three and seven. I cleaned trash out of carburetor, replaced distributor cap and rotor. The compression is good, but now misfiring on cylinders two, three and seven. Any ideas would be nice.
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Wednesday, July 13th, 2016 AT 10:19 AM

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Tiny
HMAC300
  • EXPERT
Carburetor or TBI unit? It can be either. It may be a vacuum leak feeding that area of engine. If carburetor they are good for that. So check for vacuum leak at base of TBI if that they blow gaskets there. Check plug wires for resistance 5000 ohms per foot and pull valve cover off of three and seven and see if the valves are opening as it may be a camshaft. All should open equally if not could be cam/lifter/rocker etc.
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Wednesday, July 13th, 2016 AT 12:11 PM

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