I have an 04 terminator with 40k. I got it cheap but in fantastic shape only because the guy snapped the crank snout. I rebuilt the engine too. I ported the cylinder heads and replaced the valves, ported the intake and supercharger as well. I also changed the valve springs to comp cams valve springs that support .500 inches of lift. I still have the stock cams in place. Now when I started it up, it idled perfectly and I drove it down the block and back up the street. Once I came up the street it started running rough and idled rough as hell and still does currently. I tried the frps and fpdm and nothing changed. I changed the plugs and nothing changed. I pulled the pumps and checked them to make sure they're good. I had the injectors cleaned and nothing changed. I checked the fuel pressure and it is about 40 psi and it bounces around a few psi here and there. I checked the coils as well and they're good to go. I am beginning to think there may be a tuning issue now. When I got the car it had a tune from an old tuner back in 2004. It looked to be from one of the first sct tuners that came out. Any input on this would help because I am seriously stumped now. Something like this I would have usually figured out by now.
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