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Stumbles on fast (hard) acceleration but runs OK on normal acceleration

Tiny
THESTITCHER
  • MEMBER
  • 1988 CHEVROLET BERETTA
  • 2.0L
  • 2WD
  • AUTOMATIC
  • 68,000 MILES
Engine runs fine but will stumble if you give it gas to fast. Have checked following parts/systems fuel & air filters, fuel pressure, TPS, MAP. Vacuum leaks. O2, EGR, Temp sensor, Etc.
Monday, May 25th, 2015 AT 9:58 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
When was the last tune up?
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Tuesday, May 26th, 2015 AT 5:30 AM
Tiny
THESTITCHER
  • MEMBER
  • 4 POSTS
Last tune up was done a month ago. Found a problem with the throttle body at that time (hole in fuel return port cap)which allowed pressure to by pass regulator. I repaired problem and now have pressure on rail.
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Tuesday, May 26th, 2015 AT 6:44 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Have you checked to see if there are any trouble codes stored?
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Tuesday, May 26th, 2015 AT 8:35 AM
Tiny
THESTITCHER
  • MEMBER
  • 4 POSTS
NO codes set.
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Tuesday, May 26th, 2015 AT 8:59 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Have you checked back pressure from the catalytic converter?
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Tuesday, May 26th, 2015 AT 6:37 PM
Tiny
THESTITCHER
  • MEMBER
  • 4 POSTS
Converter was replaced about 3 years ago. I will check as soon as I get home next week.
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Wednesday, May 27th, 2015 AT 7:17 AM

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