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1997 Kia Sportage Misfire on Cylinder 3

\015 My Kia is misfiring on cylinder 4 after it is driven for quite a while. New coil packs last year, plugs, wires, did plugs again last week. It runs good cold, so I didn't think it would be the injectors. I replaced the ECM, ran great for a week. Today was real hot, and it started misfiring again. It ran fine to dinner and back, and then I let it rest for 20 minutes and went to drive and ran horrible. I know that it wasn't a fuel pump issue, but I wanted to replace it before it left me stranded, 200,000 miles now. I cleaned the heck out of the throttle body, mass air flow sensor and I installed new O2 sensors weeks before this began. I ran a compression test and it was good and even. I swapped coil, wire/boot and plug from 4 to 2 and it still came back as #4 misfire after I reset it. It took a week to come back the first time. After that I changed the plugs, just for safe measure. It only does this on real hot days, and usually after it has been driven for a while. This has now been going on for about a month. The weather cooled down and I changed the ECM as the last thing. Ran really good for like a week now, probably until it learned the system...Any thoughts would be great.\015 Posted / edited by AnonymousUser on : 16-04-2018

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