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You said 'either AIS or TPS' codes. Which is it? Or both? That's likely the source of the trouble. Could be a bad sensor ground. Check the ground at the driver's rear corner of the block - the lug under the bolt. The wire is too short on these cars, and can fray and cause intermittent operation. I've had to repair them in the last two cars.

You may have to unplug the ECM and clean the contacts on both it and the harness plug to it.

Don't run a 180F thermostat. The car is made for 195F, and 180 will keep it in open loop operation longer, which means worse gas mileage and emissions and power.

Did you change the dist cap recently, too?
 
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