Reno m8,
Sounds alot like the problem i had, read my post
idle sensor/ idle prob?
after changing everything i could, including the road speed sensor, which is a bitch! and i doubt v much is the problem.
turned out to be the throttle position sensor, after taking to Renatech in Bristol, the TPS on computer was lock at 200rpm, screwed! but would still drive with the problems
This caused it to foul at lights, with no idle sometimes, when starting, rev up to 1400rpm, wobble around a bit, as if the lamba had gone, which it hadn't.
m8 i recommend you get it plugged in somewhere, will save you alot of wedge on what it might be, instead you'll know what it is!