So Ive been lurking for a while on this site trying to figure out what is wrong with this thing. OK so this blazer is the old obd I system and it is throwing a code. I can't even get this truck to go two miles down the road. Its like it has a miss and not getting any fuel when trying to go down the road. NO power climbing hills on the road. But it will sit and idle all day long with no problem. I have already checked the CPI under the plenum, the plenum was all black so no fuel leaks there. Im lost with this thing so any help will be great.