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Message: [QUOTE="ghohouston, post: 1195759, member: 9421"] My truck is 5 hours away from home right now, and acting up. Went and rescued it from truck stop where a buddy I let use it parked it. Told me it wouldn't run over 40 mph. Scanned it, had a cps code. Replaced with original black cps. Ran great till 4th gear. So we limp it to his place, truck won't go over 40. Way down on power as soon as you shift into 4th, and gets so bad in 5th you gain no speed. I tear the valve covers off after it buzz tested perfect. Found the uvch's would wiggle a bit on the vch's. So I ohmed out the uvch's and valve cover harnesses, all were under 3 ohms. I did some "rigging" with zip ties on the clips so it had no possibility of wiggling, in a hope it would make a difference. Got back together, and once again, runs perfect till 4th gear, same issue. So I get back from my 40 mph test drive. Inspect the engine harness above the drivers valve cover for chaffing, and didn't see any. I perform another buzz test, and get p1271-1278, except 1273... Sound wise, the buzz test is perfect, no difference in any of em. I'm thinking the idm is the culprit. I started the truck, with the idm unbolted from the fender, and shook it to see if it acted up, and nothing, did same with the engine harness, and nothing. Any other ideas? [/QUOTE]

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