!990 5,8l BRONCO AFTER WARMED UP DRIVES ERRATIC

[Dan 2663]

I DONT KNOW WHATS GOING ON.... MY 1990 5.8L BRONCO (FRESH MOTOR 2002) AFTER IT HAS GONE THREW THE WARM UP PERIOD, IT RUNS LIKE CRAP. ALSO HEAR AFTER THE WARM UP A HISSING / POSSIBLE VACCUM LEAK FORM BEHIND THE INTAKE AROUND THE FIREWALL. THE ERG, EVR, TAD, TAB VALVES / SELANOIDS ARE GETTING NO VACCUMM BUT SEEM TO CHECK OUT FINE RESISTANCE WISE AND SIGNAL VOLTAGE WISE :blink:

ANY SOLUTIONS WILL GREATLY HELP AND BE APPRCIATED....

DAN

 

[Bully Bob]

I would find that "hissing pretty fast......If that's "not" the prob. it soon will be.

Check carb. & power brake hoses as well B)

 

[ocalabronco]

sounds like a busted major vaccum line. also check all your manifold bolts to see if one fell out or snapped off