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Hi Robbie, my name is Jason
On an MPI engine the timing will change very very quickly for a number of reasons. The engines computer is deciding what the optimal timing should be hundreds of times per minute.
If you are getting a code for the TPS, you would replace the TPS and re-test. A bad TPS will cause the symptoms you are describing. With the engine, the ECM is always going to do what it can to try to keep the engine running. When the TPS goes bad, the engines ECM simply doesn't know how much throttle you are giving the engine, and that causes the ECM to get confused, and although it's going to try to keep the engine running, the engine is not going to run the correct way if it doesn't know how much throttle you are trying to apply. Does that all make sense to you?
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