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>>>*I have been keeping an eye on this one, time to stick my nose in I guess if I may.

A lope, or shuddery type idle can be caused by many factors, the first place we look is the TPS. If that checks out, the next place to look is the foundation. This means recheck the timing chain to make sure it's not off a tooth.

I do know (from having done it..go ahead and laugh, I am old and need glasses...*LOL**) that if the top timing mark is straight up rather than at 11:30 position at TDC the result is a shuddery idle and poor driveability.

Now if that checks out, next is the EGR. Rarely, some systems require a restrictor in the vaccum line and I concede I am not sure why it is only sometimes. Just plugging it smooths the idle out but can set off the check engine light which irritates the DEQ inspectors. We find that an early event (high torque) camshaft combined with our StreetRV does cause this once in awhile. The result is a off quality idle and hesitation at steady midrange throttle.

*I know, you didn't mention that, just checking. Anyway, go back and check all of the foundations, even a quick compression test is indicated. Simple things like tightening the head down while the cam is a tad off time can tweak a valve, that will demonstrate as an off quality idle and poor response.

I am pretty sure you know about all of this, just a couple of thoughts here, the StreetRV head will be smooth as silk when all is right....*EB



I took some pictures of the cam sprocket, distributor rotor, etc, and emailed them to Ted. He said everything looked like is was probably fine.

Compression readings are 170-175.

I put some vacuum on the EGR while the engine was running, and the result was the typical "almost stall out".