HAD SIMILAR SYMPTOMS ON MY 90 200. cAUSE WAS A VACUUM LEAK ON THR F/I DISTRIBUTOR BOOT. cHECK FOR LEAKS ON ALL VACUUM LINES. fUEL FILTER ANOTHER GOOD THING TO REPLACE. ALSO CHECK FUEL PRESSURE/ OUTPUT VOLUME AND IGNITION SYSTEM TOO. MIKE POSNER@POSNE@CTS.COM