My montero sits for weeks and after vacation a week back I jumped in it to take it for a spin like I usually do every few weeks. I noticed it didn't want to rev very high and it didn't sound the same. After driving the neighborhood I know something was wrong Because it couldn't get to 15 mph and sounded like it was bad gas or a bad pump. After draining the gas and putting almost 5 gallons of premium in I sat in my drive way reving it higher than idle to get new gas in the lines and my buddy looked under neath at smoke and seen a red hot exhaust. Thays where I'm at now