my 95 pathfinder was off the road all winter -started it every 2 weeks- last time tried to start it had to replace plugs. just put it back on road yesterday- starts great drives great when cold -when it warms up it bucks really bad can't even drive it a block-checked all vaccum hoses to make sure I didn't knock one loose when changing plugs-all are fine. can someone give me any ideas to try.....TIA