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1989 Chevy Silverado

Tiny
MATTW
  • MEMBER
  • 1989 CHEVROLET SILVERADO
Engine Performance problem
1989 Chevy Silverado V8

when I accelerate in park the engines cuts out, acts like it is miss firing. Then if I acc. Slow the truck runs fine but if I stomp it to the floor it looses power and misses the check engine light shows code 32 and 43. I changed pick up coil, ign. Cntrl mod. What might my problem be
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Friday, September 18th, 2009 AT 12:48 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
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Friday, September 18th, 2009 AT 12:53 AM
Tiny
MATTW
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I replaced the fuel pump also. Would the egr be the problem maybe. I took it to a shop about a month ago for the same thing they put a body ground on the truck and it was fine for about a month now this.
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Friday, September 18th, 2009 AT 1:11 AM
Tiny
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Clean out the EGR valve and see what happens
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Friday, September 18th, 2009 AT 1:15 AM

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