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So we have the correct map. The IACV we used is GM P/N 19351706. The TPS we used is a Duralast TPS115 which I believe is incorrect from looking at pictures. Same style, but the resistant values must...

Thanks. I have two GM GENIII engines I've tuned using HP Tuners so I'm familiar with what sensors are supposed to be reading. I believe this engine has MEFI 3.

I don't remember the P/N for the TPS...

I will double check the TPS sensor is acting within spec this weekend. It was replaced and I know it's not unplugged, but the new one could be trash from the parts store.

I've been helping my brother with his boat he bought last year (750 hrs). We've replaced everything the previous owner failed to do, got it cleaned up, and have almost everything working. The boat...