after my cars been taken for good run if i turn it off and leave it for a few mins then turn it back on again the idle bounces between 1k ish and almost stalling will do this for a min or so till i start driving then its fine. been doing this for a little bit but havent paid much attention to it till today when my boost gauge stoped working stoped the engine went few tools to have a look at the gauge. when i started it up was doing its normal bouncing idle almost to a stall point. checking the connections to the boost sensor and took off the vac pipe and the idle just went back to perfect and