hard to start and when it finally does runs like crap will not tach over 4k if u press gas sounds like it bogs down but if u give it small amount of gas it will rev to 4k throwin code 5 so i changed the map sensor same problem changed plugs and wires still same problem timing is rite on im lost please help

 

Hey man, this may sound stupid but check your engine grounds. I had a issue like this on my 89 lude but it turned out I forgot to reattach my ground from the block to the fender wall.