I have a 91 5.0. Not too many mods mainly bolt on stuff. I have a BBK SSI Intake w70mm Throttle Body and 76 MM MAF, MAC Full legnth head, MAC PRO Chamber, MAC Dumps,24lb injectors, 155 fuel bump, underdrive pulleys, a/c dead pulley and MSD Blaster Coil. I just started the car last night and set the timing to 14 degrees. I took the car around the block and noticed that one I can't get full throttle and two when my tranny shift into 2nd gear the car starts to shake really bad. It also sound like I have multiple detonations. I am stumped almost to the point of taking it in. Any suggestions?