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Message: [QUOTE="Strokersace, post: 130883, member: 622"] Ok, so talking about the 97 in my sig... I've had the motor back in and running for a week. Up until yesterday, I'd put maybe 400 miles on it and it's been flawless. Smooth crisp startups, idles nice, runs down the road great, etc, etc. Yesterday, however that all changed. Pulled into a parking lot in town and put it in park. As I did, the engine started romping horribly and the factory oil pressure gauge was flickering badly as well. Pressed on the throttle and it smoothed out and was fine. Shut the truck off and end into the store. Upon startup after coming out it was fine. I immediately put it into gear and it did the same thing all over again. I watched the scangauge and the oil pressure would fluctuate but never below 500, duty cylce was never extreme (12ish at idle, 20ish while driving). Did this off and on throughout the next hour or so while in town. Approx. 20 minutes after the initial "romping", I happened to look down at the fuel pressure gauge and it was maxed out at 100psi. Never changed the entire rest of the day. I assumed the sensor was bad again. Had to drive to a job interview in the afternoon and when I got into that town and got to the 1st stoplight, the engine died as I was slowing down. Started right back up and kept driving. Upon coming home I noticed that it wasn't starting as smoothly as it had been. It was taking more cranks to fire. Also noticed that when I was sitting there idling, the rpms would fluctuate 100 or so in both directions and you could hear it in the motor (not just the gauge moving). It'd drop into the low 500's and jump up to 750ish. Died again when I was close to home slowing down to turn the corner. Parked the truck today and just had time to work on it this afternoon. Checked the codes and the only one was the CPS code. Thought I'd change that out with an extra one I have. The one in it was a blue CPS, replaced with a new (from last year) IH black cps, one of the good ones. Decided to rule out the sensor for the fuel pressue gauge being bad. All I had for a mechanical gauge is a 160psi air pressure gauge. When I turned the key on the pressure is reading 130psi at the regulator!!! What the hell could be causing this?????? My fuel system is as such: Both tanks w/ 3/8" line into the factory selector valve, 3/8" to 1/2" line into an AirDog1 with 10micron filter, 1/2" into a Walbro, 3/8" line into a 2micron post pump filter, 3/8" to ITP bowl delete block, into front port on heads, out the back port into the regulator, then 3/8" return line back to selector valve then back to each tank. The regulated return is setup in the same fashion that ITP/Strictly Diesel does theirs. The return for my AD is y'd into the stock return line right before the selector valve. Are my rash of symptoms related or not??? And what the hell could be causing my fuel pressure to be so dang high, just out of nowhere? [/QUOTE]