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

1988 CHEVROLET BERETTA
68,000 MILES • 2.0L • 2WD • AUTOMATIC
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THESTITCHER
  • MEMBER
  • 4 POSTS
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..
May 25, 2015 at 2:58 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
When was the last tune up?
May 25, 2015 at 10:30 PM
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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.
May 25, 2015 at 11:44 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Have you checked to see if there are any trouble codes stored?
May 26, 2015 at 1:35 AM
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THESTITCHER
  • MEMBER
  • 4 POSTS
NO codes set.
May 26, 2015 at 1:59 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Have you checked back pressure from the catalytic converter?
May 26, 2015 at 11:37 AM
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THESTITCHER
  • MEMBER
  • 4 POSTS
Converter was replaced about 3 years ago. I will check as soon as I get home next week.
May 27, 2015 at 12:17 AM
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