joesenior79
Newbie
I have a 97 5.7L L31 I just finished completely rebuilding, (with a Black Bear Tune).
The issue I'm having is its a hard start and stalls anytime I put it into gear and I have hardly any power under load, struggles to make it up any decent size hill. It's great first thing in the morning but gets worse after warming up.
I have an Autel MX808 and it's not throwing any codes. However, there's a couple cylinder misfires at idle but goes away after giving it a little gas.
The only things that I've noticed abnormal are: the IAC counts are high, around 136 at idle and gets even worse while under load, and my barometric pressure is also reading high at 12.33 at idle. I'm not sure what my TPS volts at idle should be but it's reading .55v.
All these sensors are brand new and AcDelco. Am I missing or overlooking something here or maybe some faulty sensors?
I've looked for a vacuum leak with smoke and nothing.
Any advice or thoughts would be much appreciated.
The issue I'm having is its a hard start and stalls anytime I put it into gear and I have hardly any power under load, struggles to make it up any decent size hill. It's great first thing in the morning but gets worse after warming up.
I have an Autel MX808 and it's not throwing any codes. However, there's a couple cylinder misfires at idle but goes away after giving it a little gas.
The only things that I've noticed abnormal are: the IAC counts are high, around 136 at idle and gets even worse while under load, and my barometric pressure is also reading high at 12.33 at idle. I'm not sure what my TPS volts at idle should be but it's reading .55v.
All these sensors are brand new and AcDelco. Am I missing or overlooking something here or maybe some faulty sensors?
I've looked for a vacuum leak with smoke and nothing.
Any advice or thoughts would be much appreciated.