Throttle and Idle Trouble (325i)

[JPE30]

So until today my car has run relatively good other than a somewhat rough idle. Today I start the car and the idle is rough as hell and does not get better with time. So I pull out and in first gear if I pushed the throttle past about 4 degrees the car nearly dies and I have to push the clutch in and get off the throttle to keep it going. So I parked it, blew into and reconnected the AFM and whatever plug is directly above the AFM but before the throttle body.

I start the car up again and drive it, and everything seems normal now, but I want to make sure this isn't suddenly going to happen again. When the girlfriend gets back later I plan on pulling those plugs and cleaning them with a swab and some alcohol, because the plug above the AFM is pretty dirty. So, does it sound like I solved the problem, or should I be worried?

[JPE30]

I have another question, the plug that comes before the throttle body, but after the AFM, is that the Throttle Position Sensor?

[Adrian_Visser]

tps is under the throttle body i would check to see if it is working properly that sounds kind of like your problem to me. firstly i would make sure the connector isn't corroded to shit and giving you an intermittant.

there are three pins on the tps the centre one is the common/ground the other two are for idle and WOT positions respectively i would test the bottom end switch to make sure it is making properly, the position of the switch is adjustable via the screws which mount it to the throttle body but if you can't hear the idle end microswitch clicking when you let go of the throttle you may have a problem.