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A while back I had a 993 with the TPC set up using the piggy back controller inline with my ECU. The chip in my ECU was adjusted to fine tune the piggy back controller. To start with I had an idle issue with the engine stalling when coming up to traffic lights. I had to adjust the idle stabilsing valve to set a new higher idle. Second thing was a silly mistake with the throttle sensor connector and stabilsing air valves connected the wrong way round. They were colour coded on the 993. The main issue I later had was the engine cutting out. This was caused by the chip holder being worn and the chip moving causing an intermittent connection. A new chip holder was fitted to the ECU and then never had another issue. Just sharing my experiences may not be applicable to you though. Would Would worth checking you wiring connections at the ECU if using a piggy back controller and ensure the chip is secure.
Good luck
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