1993 Chevy S-10 Surging and loping

1993 CHEVROLET S-10
248,000 MILES • 6 CYL • 4WD • AUTOMATIC
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TOM SPIVAK
  • MEMBER
  • 2 POSTS
I have replaced the exhaust, O2 sensor,map sensor,temp to controller sensor,cap,rotor,plugs,wires, and still it starts good and runs well with power for about 3 minutes until warm then misses at idle and at highway speed lopes and acts like it is out of time but through out the speed range.
Loss of power also.
This is only after it is warm.
Any new ideas?
Oh yeh, it is hard to time.
Oct 30, 2009 at 9:06 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Has the check engine light come on? Have you checked fuel pump pressure or for vacuum leaks?
Nov 12, 2009 at 2:33 AM
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TOM SPIVAK
  • MEMBER
  • 2 POSTS
No check engine light on, have extensively checked for vacuum leaks, have not checked fuel pressure.
This is TBI, how do I check pressure?
Nov 12, 2009 at 10:30 AM
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