bogging/slight backfire under load

603 z71 · Jan 18, 2013

Hey guys, my trucks been acting up lately, throws all o2 sensor codes plus p1351, I replaced the igntion coild 2 weeks ago because it was doing the same thing but way worse. I couldn't even give 1/4 throttle with it backfiring and falling on its face. All the codes are pending and shut off for about 4-500 miles. Happens more when its extremely cold out. Haven't checked plugs but wires and cap are good. It mostly happens going uphill or I give it some to pass on the highway. Thank you in advance. Ohh and its a 97 k1500 with a 5.7

rcman989 · Apr 14, 2014

I have exact same problem. Did you find a solution?

IOWNJUNK · Apr 14, 2014

He hasn't been on in over a year, but those symptoms sound like a vacuum leak, a big one. Have you done anything to the truck recently?

paulson524 · Nov 18, 2017

I have the same issue going on with my 99 Tahoe! I've replaced the plugs, wires, cap, rotor, distributor, timing chain, ICM and the crank sensor. I've replaced the 02 sensor as well and still getting a code for it. I'm completely lost....

Unkel Dale · Dec 6, 2017

Hi Guys, I just started having this today It surges & "backfires" I hear a pop noise and then a loss of acceleration. I do NOT have a code reader. It idles fine. It starts messing up under load going up a hill tonight.

update three codes po171 po151 po131 all junk data to ecm from the o2 sensors in the exhaust system reset added 10 gallons of fuel report tomorrow

bogging/slight backfire under load

603 z71

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rcman989

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IOWNJUNK

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paulson524

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Unkel Dale

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