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HAve you check the vacuum ports on the upper intake for crusting over with carbon... I'd exspecially check the small line and port just behind the throttle plate.i've done the tune up stuff.. tps and put a new distributor and tfi module. but i think the kragen distributor is junk, haha they actually ended up giving me money for taking their dist, after core and stuff. anywho.. i'll check the fuel pressure. any ideas on maybe the egr valve is robbing power or something?