Check that that the throttle body is returning to its stop and not just the cable length check all the vacume pipes fo splits holes fitting also worth giving the intake pipes a check for splits& bad fitting
if its been run for a while without a filter there could be some contamination on the MAF sencer
Ive had probs with mine recently who ever did the conversion on my van(before i got it) made a hatchet job(no vag port either)
mind you ive done 50.000 before any probs(small) surfaced
my tdi 1z is over revving constantly. undriveable help!!!!!!
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