There are so many variables. Are the spark plugs gapped correctly? Are the coils all cracked. Is the air filter clogged, restricting the amount of air during cold/enriched startup? With 197K, you must be using the newer version of the ETM, but that could be a problem. The MAF could also be dirty and giving false readings. The throttle body could also be dirty and messing up the air flow. Same with the engine coolant temp sensor, or the O2 sensors.
Klaus
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Always willing to listen, just not able to take direction.
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