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Engine will not stay running

Tiny
ERICH CLASEN
  • MEMBER
  • 1998 CHEVROLET MALIBU
  • 3.1L
  • V6
  • 2WD
  • AUTOMATIC
  • 149,567 MILES
Replaced engine new engine will not stay running. It will start then shut off if I give it the pedal. It misfires but will run rough popping and shuddering as soon as I let off the gas pedal it quits. Check engine light comes on and sets a p0300 code, random misfires. Every thing hooked up right and should run but I cannot figure it out by my self. Will not run long enough for me to get out and look for problems.
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Tuesday, October 17th, 2017 AT 10:44 PM

4 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
If you are sure all connections are okay? Check for a vacuum leak at the induction manifold.
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Tuesday, October 17th, 2017 AT 11:23 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,446 POSTS
What year engine did you put in as a replacement?
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Tuesday, October 17th, 2017 AT 11:53 PM
Tiny
ERICH CLASEN
  • MEMBER
  • 2 POSTS
It was another M code engine not sure what year every thing was exact fit.
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Thursday, October 19th, 2017 AT 1:40 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,446 POSTS
What was the issue with the old engine? What is your fuel pressure like and have you double checked for any leaks? P0300's are common with low fuel pressure and vacuum leaks.
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Thursday, October 19th, 2017 AT 7:10 PM

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