im new to grand nationals and my 3rd car its an 85 t type. i have very little history but what i have found out is i have a 87 ecm 84 chip 87 maf 86/87 icm and coil (wire harness conversion) new throttle position sensor factory fpr factory turbo (i think) car misses like crazy, no codes, and makes almost no boost even at full throttle run about half mile worth