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So I just received my 2 Steeda tunes to put on my Sctx4 tuner and when I did my car would start for about 1 second then die. Did this to both tunes. Then I installed the pre loaded tune the sctx4 came with and it worked fine. Any ideas why the steeda tunes wont work? I bought the tuner from...

Practically new I put this on but didn't really like the "whistle, whine" sound but that's just me. $90 shipped anywhere in U.S.A 450-638 is the model number thanks

So I just unplugged the negative on the battery to install an intake spacer and now my car runs, sounds completely different. I bout it used with 14k miles on it. Could it have had a tune that I just erased? Honestly not that fun to drive as it was before. Any ideas? It has a roush cold air...