5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
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When the engine is cold, RPM will go up and down to start (which I think is normal, but I can't say that I noticed it before), and then it steadies for about 30 seconds to 1 minute (but even then the rpm wobbles between 700-900). And then it starts to idle really rough, car is shaking at that point, almost stalling, but it revs back up just in time to avoid the stall.
If I rev up the engine passed 2000 RPM it seems to run just fine, or maybe it's just hiding the problem at that point? I'm really at a lost as to what could be going on.
I triple verified the spark plug wires and firing order on the cap and they are fine.
Here's the parts I put in the car :
52913 - Ford Motorcraft OEM Spark Plugs (87-95 5.0L)
14212 - MSD Super Conductor 8.5mm Spark Plug Wires - Red (79-93 5.0L)
14230 - MSD Replacement Cap & Rotor (86-95 5.0L)
14205 - MSD TFI Performance Coil (86-95 5.0L)
Any help is appreciated. Thank you!!
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I figured it out not too long after. When doing the tuneup, I moved the distributor a bit when changing the distributor cap, which messed up the timing.
Yep - a small turn of the dizzy will do that every time! Follow links above that marlyman posted to reset your idle, too. Make sure your TPS is in range. You'd be surprised how nice your car will idle afterwards. My car had severe "rolling idle"... now it holds steady at about 850 rpms at idle.
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