I have a 98 gt that I recently did a complete PI swap and 5 speed swap in. Engine came out of a 2005 crownvic. I bought the engine with a Trick flow track heat or street burner intake (not sure which one yet as i didnt think to get the modle number off of it when i installed the engine) already on it. So car has the intake with a accufab single blade throttle body, jlt cold air, new bbk maf, bbk shortys with pypes off road x, msd coils and FR 9mm wires. Other than that, the engine is a stock PI. I'm having idleing issues. Rough idle and non cosistant. I originally had hanging idle. I made a IAC place with a smaller diameter hole to prevent so much air flow, it fixed that issue but now it is idleing at 1100 sometimes 800. It's never consistant. Ive tried adjusting the idle screw along with testing and adjusting the throttle positioning sensor. If I lower the idling just slightly, the engine won't stay running. Also while driving, say in 3rd gear i let off of the gas and let the car coast down to about 2k i then push the clutch in to downshift and sometimes the rpms drop to 400-500 and come back up to 1100, sometimes it drops completly and car dies. I've also replaces all of the vacuum lines and can't find any leaks. Are these 2 issues related? Could the intake really be causing these issues as it's a lot of air on basically I stock Engine? Would upgrading injectors to 24lb help? ( they probably need replacing anyways ) any help is greatly appreciated. This issue is very annoying and I've exhausted all that I know to check and do.