Engine will not stay running

1998 CHEVROLET MALIBU
149,567 MILES • 3.1L • V6 • 2WD • AUTOMATIC
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ERICH CLASEN
  • MEMBER
  • 2 POSTS
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.
Oct 17, 2017 at 3:44 PM
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MHPAUTOS
  • ✓Experienced Mechanic
  • 31,937 POSTS
If you are sure all connections are okay? check for a vacuum leak at the induction manifold.
Oct 17, 2017 at 4:23 PM
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STEVE W.
  • ✓Experienced Mechanic
  • 15,409 POSTS
What year engine did you put in as a replacement?
Oct 17, 2017 at 4:53 PM
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ERICH CLASEN
  • MEMBER
  • 2 POSTS
It was another M code engine not sure what year every thing was exact fit.
Oct 19, 2017 at 6:40 AM
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STEVE W.
  • ✓Experienced Mechanic
  • 15,409 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.
Oct 19, 2017 at 12:10 PM
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