Hello! On very hot days when I am running the AC my engine will run rough, as if a cylinder is not firing. It will continue to run, not stall, with a steady check engine light. After a while it will start to run good again (especially if I get it up to highway speed for a while). I re-set the check engine light and all is well to it happens again. (Temperature meter reads OK, mid-range) I suspect it is a coil-pac or maybe a relay. I have cleaned out some rust under the coil packs and have swapped the relays around. I am still testing. Wires and plugs are good (new). What do you suggest? I am thinking New Coil Packs, Relays and Diode. ?
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Thursday, March 19th, 2009 AT 8:20 PM