well we all know its better to think with more than one head combined.. i just put another b18a1 head in my da because the old head has a bent valve and i picked this head up for 50 bucks... long story short the head had nothing on it but the valvetrain.. all the sensors had to come off the old head,also i reused my intake mani and upper water neck. well long story short i got the car running today, but upon crank up it started idling at 3,000-3,400 rpm range, then as the motor warmed up it started to flux idle... i adjusted the fast idle screw all the way down and the lowest it got upon it warming up was 1,500-1,800 rpms... also the temp gauge goes straight to H. even in acc 3 it is still pegged on hot. so.. i got to thinking maybe a bad ground? but the only ground i busted loose was the valve cover ground.... if you pull the clip for the ect gauge sending unit it drops to cold on the gauge cluster but throws a check engine and and runs like ass..... i have bronchitis or however the fuck you spell it and my magnum is killing me on gas all i wanna do is fix this problem, so my brains pretty much crap right now so maybe someone can help or something... i still think bad ground somewhere but i didnt take any other ground loose, and sensors never threw a check engine before and there is nothing diff but the head. thanks and sorry for all the confusion!