Is there a difference with the engine between the 86.5-90 7mgte and the 91-92 7mgte???? It seems like everywhere I look such as manuals, they are seperated. I know that the body has minor cosmetic differences. I have a 91 turbo and was looking for a repair manual and it seems like the 91 repair manual is hard to find. The only one I've ran across is the 86.5-90 turbo...but that won't work right????