93 6spd tt, only thing done engine wise is a catback and intake. I noticed over the last week or so when I go WOT it wont build boost over 0.5bar and stutters/hesitates. The idle also gets a little bit lumpy (when you tap the throttle you can feel the lumpy-ness).
It seems that I can take the car out, let it warm up, do a pull or two (running fine), then it will start doing the above.
I checked the coilpack connectors, they are all fine and making contact well. I'm thinking it might be an actual coilpack.