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1990 GMC Sierra hesitation

Tiny
JAMES1973
  • MEMBER
  • 1990 GMC SIERRA
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
When the motor warms up and I reach 35-40 mph the truck hesitates as if it was running out of gas.
It only happens in overdrive. If I let drop below 35 or go above 40 it drives fine. No codes and it has a TBI carb.
Wednesday, May 14th, 2014 AT 5:15 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
These like to blow the gasket under tbi so check for that as it would be a massive vacuum leak. Also check for soft hoses leading to map sensor and pcv valve. Check fuel pressure 9-11 psi
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Wednesday, May 14th, 2014 AT 6:21 AM

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