ok i am getting a 86 f350 with a 7.3 turbo(banks sidewinder). it has a problem of stalling. it sounds like its skippy at idle. when you give it some throttle it sounds bogged down. it will stall out and wont start back up for about an hour. any ideas on where to look. po said he had the #4 injector replaced and it had build up on the bottom of it and he thinks it got on the piston and ruined the rings... it does smoke some at idle and alot when you rev it up.will bad rings cause this? or is there another problem?