could use some help, i put a remanufactured 5.7 (350) engine in my 88 blazer , all new sensors,timing set at 0 with tan/black wire diconected ,throttle body was rebuilt (yes new brass bushings)i mean everything has been replaced with new parts , was getting code 43 ,replaced knock sensor again,no more code , reset the computer, the truck is just not running 100%,sometimes when i start it it idles up n down then smoothes out, get a bit of hesitation at take off ,i looked for intake leaks and tbi base gasket leaks ,havent found any ,my ecm seems to be fine unless i have the wrong eprom and calpack in it , ecm is 1772247, akaj, eprom says 1147 akaj, calpack says 16051637,hopefully these are the correct ones ,the motor is bored 30 over with a stock cam ,444 lift, so im told , it just doesnt seem very smooth, seems kind of rough, im freakin lost , also the air idle was set with iac closed, injectors getting .50 at idle bout 435-440 wot , im open for any info that can help me out , thanx jim

 

I have an 89 blazer and mine is doing the same thing. Today me and my buddy set the timing to zero, but then advanced it a little and it seemed to help some but its still running rough. I've got three different PROM chips and I've tried all of them at different points to see what it might do. I got the truck from a guy who had a family member put the motor in for him after it was stolen from him. So its in rough shape and I'm just trying to figure out how to get it to run right so I can start working on some of the other things I want to like the paint and interior. But if it doesn't run then I have no use for making it look better.