Hi guys, first post. I have a 1998 Mustang GT (117,000 Miles) with a rough idle and misfire at low RPM's. I either cant hear it at high RPM's, or the misfire doesn't occur. The engine also shudders during idle.
- I cleaned the MAF
- Replaced PCV Valve
- I can hear each one of the injectors clicking using a mechanic's stethoscope, ( could be a bad spray pattern still?)
- Pulled a few spark plugs, looked Ok not great, maybe a bit of ash deposit but thats it.
- Could be bad spark plug wires.
- Then I scanned it with OBD Tool, Got codes PO171 and PO174, running too lean.
So thats why im thinking its a vacuum leak, what other things could it possibly be? And if you guys think its a vacuum leak where could it be coming from. Im hoping its not the intake gasket.
Any suggestions are appreciated!
- I cleaned the MAF
- Replaced PCV Valve
- I can hear each one of the injectors clicking using a mechanic's stethoscope, ( could be a bad spray pattern still?)
- Pulled a few spark plugs, looked Ok not great, maybe a bit of ash deposit but thats it.
- Could be bad spark plug wires.
- Then I scanned it with OBD Tool, Got codes PO171 and PO174, running too lean.
So thats why im thinking its a vacuum leak, what other things could it possibly be? And if you guys think its a vacuum leak where could it be coming from. Im hoping its not the intake gasket.
Any suggestions are appreciated!