so i just picked up a 87 silverado with a newer fuel injected 350. i just did a full tune up on the bitch but the engine likes to stall. whenever i reverse, the truck acts like its about to cut off all the time and half the time it does. i had the modulator tested and they said it was fine. does anyone have any idea of what it can be? its driving me insane

 

vacumme leak maybe . . check the hoses . . take a can of carb cleaner or starting fluid . . . check base of tbi . . all around intake . . vacumme hoses . . . .see if it picks up speed . .

 

yea all the hoses look fine and no hissing. i doubt its buildup on the heads or intake cuz it only does it in reverse and it idles fine. i took all the anti-pollution pumps and shit off and put headers on there and got like 2 hook ups that dont go to anything now. plus to make it worse the bitch doesn't like to start anymore. the battery reads like 12.10 volts but wont start. im startin to reach for the for sale sign here soon

 

thought you said was doing it alot . . in drive . . at idle stuff like that

 

http://autorepair.about.com/library/faqs/bl930a.htm

maybe?

 

It doesn't matter what voltage the batt is putting out nearly as much as the amount of amps it is working with. Take it to advance to test the battery. You might want to try to cap off those hook-ups with something, those might be important.