200 Rodeo

I have a 2000 Rodeo that has been a nightmare. The engine blew after one year, which Isuzu did replace under warranty. However, it was running rough before, and after the new engine, and the check engine light would come on shortly after the dealer supposedly fixed it. Dealer replaced intake gaskets several times, saying it was an Isuzu problem. It continued to run rough, with terrible gas mileage. Right after warranty expired, they decided it was my #1,3,6 spark overcoils, which they replaced for $400 out of my pocket. 35 miles later, check engine light was back on. Independent repair shop checked it and said my catalytic converters were bad and needed replacing: dealer said maybe, but I would have to pay the $1400 out of my own pocket, even though manual says 8yrs/80,000 miles on warranty. Engine still runs rough and check engine light still on. Anyone else having similar troubles with Isuzu and Rodeos? No wonder Isuzu only has a 3.5 % customer return.