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I replaced my clutch a few days ago, but now that the car is back together it's idling weird. It has a rough pulsation to it at idle, and gets worse at 1,100-1,400. I've checked and double checked and a number of other things, until i plugged my old K8 ECU in for the flashing codes. Besides reading out the normal EGR codes, it reports code 25 - Fuel pressure regulator control solenoid. My fuel lines are not crimped, checked. My question is, where the hell is this thing located in the engine bay, and could it be causing this bumpy idle? Help would be very appreciated.

BTW. I can't tell if there is any power loss other than the rough idle - it doesn't much feel like that, but it's been raining here and I've got that new clutch so i've been taking it easy. Thanks again. Cheers.

I should have mentioned - like most ZE-ers I don't usually have my EGR equeip on - so the solenoid isn't even on my car now. No wonder the K801 was spitting code 25. The FPR is connected directly to the intake manifold.

I don't know that I was thinking earlier - the car sounds like s--- compared to normal at all rpm ranges (not as smooth) and doesn't have full power. The only slight possibility I can think of is that I minority dented my ignition coil (Thanks, Gro ) when removing the tranny. It's really not a big dent at all (near the bottom). I just wasn't sure how those things were made and if denting it would cause that huge-a-- capacitor to malfunction.

I suppose it could be anything. Help still appreciated.