I've got a '91 5.0 with about 130,xxx miles and about 2 weeks ago it started having trouble on a cold start/idle (dropping to ~200 and almost stalling before bringing it back up), and idle RPM's are sporadic (moves between 600~800). I replaced Distributor Cap, rotor, spark plugs, and wires and it didn't help. Cleaned old IAC Valve, didn't work. Replaced old IAC valve last night, and this morning car actually stalled for the first time (had to gas her to keep her alive), so i don't think that helped either haha.. Once warmed up, car rides fine, starts fine, but still idles a bit uneven. I've read that the ECT Sensor may cause this, but the car doesn't overheat ever. The temp guage never even gets above the middle line, even when running it hard. Fuel Pump does whine like a mother-father, and i've read that can cause stalling itself, but not the low/sporadic idle i've been getting. I never run the car under a half tank of gas.
Only mods on car are cone filter, and BAMA tuning chip. These were done months ago and I don't believe they're part of the problem. Any help would be appreciated.
Only mods on car are cone filter, and BAMA tuning chip. These were done months ago and I don't believe they're part of the problem. Any help would be appreciated.