Idle problem/ Boost cut in 3rd on 1997 STI
Hey, I really need some help with a weird problem my 1997 STI limited has got, on idle every 10 seconds or so the engine misses a bit and you can feel the engine jolt slighty, almost like it is about to cut out, but it never cuts out, also in 3rd gear only at about 5000 rpm the boost cuts out and the engine jerks something terrible, it only does it in 3rd gear, the idle problem seems to be there all the time but the boost cutting in 3rd only happens every now and then, this might be weird but it always seems to be after it has rained. or been washed, but this might be nothing to do with it. i have only owned the car for a few months, but the dealer i bought it off said it had been tuned and had some mods on it, Any Ideas???