I've got a 1990 s13 hatch back the engine has a miss at about 2000 rpm and at idle sometimes. I've taken it to a number of mechanics and had diagnostics done on it. Diagnostic reads normal. I'm getting spark to all the cylinders and i replaced all the feul injector connectors. Also the rear end of the car shakes upon acceleration just in the begining. If anyone has any info on these subjects please respond. Your information would be greatly apprieciated.