1994 Chevy Pickup 5.7L idles fine but...

1994 Chevy Pickup 5.7L idles fine but sputters and backfires under load

Dragon

Sacramento, CA

#1 Feb 7, 2013
Driving aound town is fine but if I'm on the highway for more than 30 minutes my 1994 chevy truck will start backfiring and lose power to where I have to pull off the road. For example: I was driving up hill and as soon as the truck down shifted it started sputtering and backfiring. I pulled off the road and the truck idled fine, would rev up fine with moderation but if I stomped the gas pedal it would sputte and backkfire. I let the truck sit for an hour and drove home with no problems. Two weeks later the same thing happened again. The check engine light doews not come on and the guages read fine. The truck is currently running fine.
Anthony

White Plains, NY

#2 Apr 19, 2014
Dragon wrote:
Driving aound town is fine but if I'm on the highway for more than 30 minutes my 1994 chevy truck will start backfiring and lose power to where I have to pull off the road. For example: I was driving up hill and as soon as the truck down shifted it started sputtering and backfiring. I pulled off the road and the truck idled fine, would rev up fine with moderation but if I stomped the gas pedal it would sputte and backkfire. I let the truck sit for an hour and drove home with no problems. Two weeks later the same thing happened again. The check engine light doews not come on and the guages read fine. The truck is currently running fine.
did you solve this problem? Mine does the exact same thing

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