mini me acting up

yeah my friends mini me seems to get real sluggish once it reaches operating temps..and (sumtimes) throws a crank angle code..on cold start it has crisp throttle response but once warm it gets sluggish.. any ideas? a6 block..z6 head..obd0 aftermarket ignition system

check your coolent temp switch, may be acting up thinking the engine doesnt warm up, keeping it in closed loop mode.

also check the crank angle sensor, they read in ohms and are heat sensitive could be going whacky once its warmed up.

i dont really think its the temp switch, if it was it the fast idle wouldnt go down.