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Engine will run too rich at low load and idle. May not hurt anything for the short term, but gas mileage will drop and it'll be sluggish off the line. Cat may wear out faster as well.

Try connecing vacuum straight to the FPR, bypassing the vacuum valve.

good idea. I'll give that a shot and report back later.

<img src="/forums/images/graemlins/confused.gif" alt="" /> Crap....bypassing the VSV and going straight to the FPR did nothing to reduce the misfire/studder. Now, leaving the vacuum line off of the FPR and plugging it DID make it smooth out. Is this a sign of a fuel pump starting to go bad??? It's only 21 years old <img src="/forums/images/graemlins/smile.gif" alt="" />

'86 4x4 SR5 22re 5" lift 35" BFG's and 5:29 gears.
'05 4x4 DC Tacoma TRD Sport