Plug gap between 0.040" - 0.050" should be fine. The coils are just held in place by the bolts, 5 lb-ft is all that is needed. You didn't put the fuel filter in backwards did you? There should be an arrow on it and it should be facing towards the engine.Car has 58k, on Saturday I replaced the stock plugs with the Champion one piece. Gapped to spec, torqued to 25ft lbs. Also replaced the fuel filter. Car ran good all weekend. Tuesday morning on the way to work, about 75 miles later, I noticed a slight intermittent missfire. Mostly between 1000-2000rpm under light throttle. Still runs fine otherwise and has plenty of power. Doesn't seem to missfire under heavier throttle.
Anything in particular I should check? I thought maybe I closed one of the plug gaps putting them in but then I don't think it would run good under heavier throttle.
I did notice I snugged the coils back down with a 1/4" drive ratchet, I looked at them and I can wiggle them with my hand but I didn't want to overtighten them and chance breaking them. How tight should they be? Hopefully it's just causing a bad ground or something