When hot it dies when I put it in gear

1991 GMC SONOMA
150,000 MILES
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91GMCSONOMA
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I have a 91 gmc sanoma 4.3 automatic. It idles fine in park and nuetral but dies when you put it in gear. But only when it gets hot. I've already replaced the alternator, battery, egr valve, throttle position sensor, idle air control valve, new wires plugs cap and rotor air filter. Please help me out.
Sep 16, 2013 at 10:17 AM
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HMAC300
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scan for codes and check fuel pressure first with a gauge if this is atbi unit then check under it for a vacuum leak as they blow the gaskets there. spray choke cleaner under tbi front and back while idling. if it changes rpm it's leaking.
Sep 16, 2013 at 10:36 AM
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91GMCSONOMA
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Any other suggestions
Sep 17, 2013 at 8:34 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
if you don't do what I suggested you have no where to find a good answer.
Sep 18, 2013 at 6:07 AM
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