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84LX89GT · 02-02-2006, 08:46 PM

I had a '91 2.3L mustang that did what you're talking about, what happened was one of the ignition coil packs would intermittently fail and run rough and then run good again. After 1 ignition coil and module replacement it ran good for almost a year before it did it again.... I replaced the other coil and it ran fine....until i wrecked it.

Note: just like you described the engine would run on only 2 cylinders. Each coil pack is in charge of 2 cylinders. It is a waste spark system meaning that the other plugs/wires fire on the exhaust stroke, each pack has 2 ignition wires and 2 waste spark wires going to them.

Chances are that you have a coil going out.

02-02-2006, 08:46 PM	#2
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	Re: Running Rough, No power I had a '91 2.3L mustang that did what you're talking about, what happened was one of the ignition coil packs would intermittently fail and run rough and then run good again. After 1 ignition coil and module replacement it ran good for almost a year before it did it again.... I replaced the other coil and it ran fine....until i wrecked it. Note: just like you described the engine would run on only 2 cylinders. Each coil pack is in charge of 2 cylinders. It is a waste spark system meaning that the other plugs/wires fire on the exhaust stroke, each pack has 2 ignition wires and 2 waste spark wires going to them. Chances are that you have a coil going out. __________________ 2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)