1996 GMC C1500 replaced 305 with 350

1996 GMC C1500
202,000 MILES • V8 • 4WD • AUTOMATIC
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JIM O
  • MEMBER
  • 1 POST
Replaced original 305 engine with a 1998 350 engine.
Engine runs great, except when maintainibg a highway speed, it misses. It accelerates fine, and it idles fine. However, trying to run at 50-60 mph or any other steady speed, it acts like it has the hiccups. What do I need to do?
Dec 1, 2008 at 5:56 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi:
There could be many causes. Therefore, I recommend having the computer scanned for trouble codes. It will limit the cause and point us in the right direction. Let me know what you find.

Joe
Dec 15, 2008 at 10:31 AM
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