Why is my car missing and skipping
My car is slugged and won't pick up speed and missing
Repair guides and support for the fourth generation of Ford Mustang, including the Mustang GT and Mustang Cobra.
If you have had a tune up done recently, IE, spark plug replacement, HECI Accel Coil pack, Remove the plug wires one at a time while the engine is off and examine them for damage caused by electrical discharge through the plug wire insulation, it will look burnt and like something bursted out from the middle of the wire. I had this happen to me after installing and Accel Coil Pack, the Plugs were bad and the HECI discharge was too much for the wire/plug causing a massive energy burst to the engine ground system, this was causing major power drops on the freeway making the engine feel bogged down.
Find the bad wire, replace the wires with High performance wires and plugs which are necessary when using and HECI coil pack, Cheers.
I would check the coil pack, I was having an intermittent missfire that became worse until the cylinder was completely out. It turns out my coil pack had cracked and allowed moisture to get in. I would start cheap checking and replacing the plug wires and spark plugs. Reading the plugs after pulling them will give you some indication of whats going on. If you don’t have a code reader handy to find out which cylinder has the missfire you can user a laser temperature gauge to check the temperature of your exhaust manifold at each cylinder. The missfiring cylinder will read cooler.
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