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how does a tune go bad? not trying to be a smart ass, just wondering...
I honestly have no clue especially since its running on AEM, after the previous owner got it tuned he said it went bad after a few months and started running rich. When I got the car it was driveable and would reach full boost (25 psi) but would be running rich as hell and spuddering with anything more than 1/4 throttle. I replaced the fuel pump when it went bad about 2 months ago and it ran a bit better, but 2 weeks ago it started running rougher and I stopped driving it. I replaced the o2 sensor and checked the coils to see if it was missing but still its running rough, im gonna remove and inspect the plugs when it's nice out again. I just don't have time or money to keep tinkering with the car anymore, with a tune the car would run a lot better since it was tuned with weisco 8.5:1 pistons instead of the current ross 8.3:1 pistons, and the previous head was the same build excpet for a port matched exhaust side.