on my 89 62 I've got a weird sputtering. I idle fine and foot to the floor no problem but it seems to have less power than it should. at mid throttle though it sputters, coughs, backfires, and basically runs like crap. but if you punch it or let off the gas it goes back to normal. I know theres gotta be something I'm missing. it doesnt seem to be related to my rusty tank cause I got through a dat in the woods after my last tank drop, no worries. getting back on the main roads though the problems began.