ok so i got my 2000 tibby. 2.0 4cyl. no CEL to start with. at first some idiot had the coilpack hooked up and just thrown in ontop of the bad one and didnt even mount it right. had it for a week or so. then my CEL came on. said i was gettin misfires plus a random misfire in all cylinders although the car still ran and sounded very decent. so replaced the coilpack. plugs. and wires and cleared the codes. full throttle just past second gear codes come back on. now just cyl 1 and 4 plus a random misfire. replaced the intake manifold gasket. still got the same codes. i am at a loss!! only idles slightly rough when warmed up. 900-1000rpm idle drops and sputters to 350-400 and comes back up. lacks a little power i think. suggestions anyone?!?!?