Wow dude you really screwed this one up alright I'll help you fix it you gotta go to Carquest and get the flux tester so you can test the capacitors under the dash. Depending on your year depends on it's location could be under the wheel or behind the heater box after you test that for lunch have some locos tacos @84Ttop @TOOLOW91 after all that go to advanced auto and buy a set of mufflers from them big glass packs you know the reds one because it seems like you have a restriction on your exhaust side hope this helps
You're probably pretty close then. GT40X heads aren't huge horsepower and torque makers....nor are any of the other parts you've got listed. The more elaborate the parts, the more elaborate the gains will feel. Your combination of parts is pretty conservative and so too will be your gains. After tuning, you may have very well picked up 20-30rwhp, but in a 3,300lb car, 20-30hp isn't really going to jump out and grab ya.