I recently purchased a '91 Civic EX and was told the car steadily misfired on cylinder one. Well I quickly realized that the engine smokes when it gets into the higher RPM range. I also noticed that cylinder one had no compression while idling but seemed to gain a slight bit while I was on the throttle. Everything I've seen has said that this is most likely the piston rings. If it is, I'm just going to replace all the pistons with brand new ones. I'd like to know if it would be better to go with the P29 ZC pistons or to go with GX pistons on LS connecting rods. I'd like to do the gx pistons if possible, but I'm having a hard time finding them. Any links and help would be greatly appreciated.