I have a 1990 Isuzu Trooper W/2.8L V6,I went to start it the other day and the engine light was blinking,after driving I noticed a loss in power but no missing,I also noticed that when I accelerated 50% pedal or more that the engine light stayed solid on and when I let off it goes back to blinking.after driving about 7 miles I stoped and noticed that my Catalatic converter and both exaust manifolds was RED glowing..so I figured that my Cat was plugged up.I just came back from getting a new Cat and muffler,the manifolds are not getting red like before and it has more exast comming out now...but the engine light is still blinking and still becomes constant when i accelerate,It still has a loss of power sputters when i accelerate but idles good.but now when I let off the throttle going down the road it is backfiring out the tail pipe.please help I cant figure this out and cant spend alot of money figuring it out.Note : from the time it started untill I had the new cat put on I did not put more than 20 miles on it.Oil is fine and so is the coolant and has a newer radiator on it.since i replaced the cat. converter the manifolds seem normal.