this car is driving me crazy ok i been having the p1200 fuel injector circuit code and my cylinder 2 misfiring but now im getting the p0121 but the problems is now when my service engine light flashing my car shift perfect but for the last couple of the days the light been solid and my trans act as if it dont want to change out of 1st gear and my boost guage getting stuck on 4 bars but if you drive around like for 10 minutes the light start back flashing and the trans start back shifting perfect i bought another throttle position sensor that didnt fix the problem i hope someone can help me