stumbling snd sparkknockin
03-24-2012, 11:10 AM
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Car: 89 iroc
Engine: 355tpi
Transmission: jasper 700r4
Axle/Gears: 4.11 lsd
stumbling snd sparkknockin
ok so first off the car is a 305 tpi with a 350 chip headers and completely stock otherwise. the car runs good a part throttle and at cruisin its nearly good but it has a lil stumble every 30 seconds or so. under half to full throttle it spark knocks hesitates bad and if i hold into it it starts to smooth out but it takes a couple seconds. yes i no it already runs lean because of the chip bt it does it bad bad now. so far iv checked and set the timing rite and put a new fuel filter on anyone with some ideas it would b appreciated.
03-24-2012, 11:28 AM
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Car: 1988 Pontiac Firebird Formula
Engine: 5.7 TPI
Transmission: 700R4
Re: stumbling snd sparkknockin
Should be running rich with the 350 chip in open loop...... what's fuel pressure look like?
03-24-2012, 12:28 PM
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Car: 89 iroc
Engine: 355tpi
Transmission: jasper 700r4
Axle/Gears: 4.11 lsd
Re: stumbling snd sparkknockin
well its got the 350 chip with 19lb injectors and im gonna get the fuel pressure guage later today
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