STUMBLING BAD AROUND 45, WILL STILL STUMBLE AROUND AT 75 OR 80

Tiny
JEHANEY1946
  • MEMBER
  • 1998 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 350,000 MILES
HAVE REP. LACED DISTRIBUTOR, ELECTRONIC SPARK CONTROL. CHECKED TPS. REPLACED FUEL INJECTORS, DID INJECTOR BALANCE TEST, FUEL PRESSURE TEST
DID A MANUAL RELEARN/ PULLED FUEL PUMP RELAY. STILL RUNS. CHECKED ALL GROUNDS.



Do you
have the same problem?
Yes
No
Wednesday, July 1st, 2015 AT 10:13 AM

3 Replies

Tiny
HMAC300
  • EXPERT
Are there any codes and what was fuel pressure? Did fuel pressure hold at least 10 psi after shutdown?
Was this
answer
helpful?
Yes
No
Wednesday, July 1st, 2015 AT 10:23 AM
Tiny
2CARPROS MIKE
  • ADMIN
JEHANEY1946
July 2, 2015.

55 to 57 pounds yes hold pressure within 10 pounds also have installed new a/c plugs and wires, also put a data logger on it and it has no miss. Will stumble and rpm doesn't change.
Was this
answer
helpful?
Yes
No
Thursday, July 2nd, 2015 AT 1:34 PM
Tiny
HMAC300
  • EXPERT
Fuel pressure should be 60-66 psi with 60 being minimum. Looks like it needs a fuel pump
Was this
answer
helpful?
Yes
No
Thursday, July 2nd, 2015 AT 5:08 PM

Please login or register to post a reply.

Recommended Guides