Bad Idle & Misfire: Help appreciated
Okay, its a '93 T-bird with the 3.8 V6. As my title implies, it has a rough idle/shake to it especially at lower rpms. It has never been a smooth car, but it has gotten worse over time.
What I replaced:
-Plugs & wires
- Distributor cap & Rotor
- Fuel Filter
- Fuel Pressure Regulator
-MAF sensor clean
That's all the relevant parts that come to mind right now.
- Run 93 Octane
- Change oil regularly
- No CEL
- Got a code 558 (KOEO) for "EGR Vacuum Circuit Failure"
- Has been dying at idle sometimes, but can this EGR issue really be messing it up like this? I have replaced so much, and it hasn't responded too much to my work. I have yet to find someone who can figure this out, unfortunately. So, does anyone have/know of this? I have no problem fixing this, but id rather not if it doesnt help like everything else. Any and all thoughts appreciated
1993 Thunderbird LX. 3.8L with Underdrive Pulleys, Ford Racing Limited-Slip Differential, Intake & Dual Exhaust, and I like to run advanced timing