Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
I’m working on a Chevy van that came in with a p0300, p0171, p0174. I’m still kind of new to diag and any help I would appreciate. Car only missfires and run lean only after about 1600rpm. Runs really good at idle. Plugs and wires are new. MAF is also new. Check fuel pressure it’s 56 to 60psi.
