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you may have a bad throttle position sensor,if you know someone with a good meteryou can check the resistance when you change the trottle position it should be a smooth change up and down in valueif it junmps it is bad
The throttle position sensor is mounted on the throttle body. Follow the big hoses from the air filter housing back to the engine and the first part on the engine you come to...... is the throttle body.
Buy the throttle position sensor first and match it to the part on the throttle body to identify the part you want to change.
Your transmission problem could be related to the TPS sensor. The TPS sensor indicated to the PCM when and what gear the transmission should be in. As for the Lucas and other additives to the transmission may be doing it more harm then good, As the transmission oil is thicker, the transmission line pressure increases. The PCM try's to compensate for that by letting the converter lock up clutch to slip and the fluid retention in the solenoid to change gears stick causing it to shudder between gear shifts.
Recap, Check the TPS sensor readings and the Wire Harness. Look for loose connections and corrosion that may not be giving the proper readings to the ECM. Rescan the car for any DTC codes and most transmission chop can do that for you if your going to get it serviced there anyways. Have the transmission fluid flushed and filter changed, and have them do a transmission line pressure checked, there are additives out there to keep the fluid from foaming which is ok, but changing the fluid's weigh can cause transmission failure. Good luck and hope this helps and keep me posted, be glad to help.
sometimes the gasket under the trottle body goes bad. spray carb cleaner at the base of the trottle (not down into it) body while the engine is running. if the idle changes your on the right track. its an easy gasket to change.