the places I took it to have the code checked told me their machine don't go back that old,(mine is a 94) it has the carb, type fuel injection,I know there is a name for that but I can remember what it's called, can those be cleaned if so how? also where is the egr.? I know a while back I was having a similar problem,(somewhat) had it checked out and was told to change the oxg. sensor which made a world of differents for awhile,then a couple of months later it started again, this is why it's a hair pulling deal for me seems like the dam thing don't want to go out of town