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What I would do (what I have done) is run through the DME Diagnosis / Troubleshooting guide in the factory service manual and measure everything. So many things can be off and they all interact so you need ground-truth on each thing.
And clean every ground you see (look for them). And look for vacuum leaks. And get your injectors WitchHuntered.
I would also wait till your running well before chipping, of course.
Use Techron injector cleaner in the gas tank, and Mahle oil filters.
Best of luck.
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1995 993C4 guards red
1988 944S alpine white
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