4.3l Vortec Wont Idle

[nortzy]

swapped a 4.3l vortec from a 93 Jimmy, to a 4.3l vortec out of a 93 Jimmy, the exact same motor, changed the plugs, wires, intake, rotor, cap, anything to do with fuel(filter, pump, lines, spider, injector) there is no codes, and it starts, runs rough, then stalls, even afrter and during driving, i have to 2 foot to stop. any idea? because i haven't a clue!?

[Zembonez]

On newer 4.3 swaps you have to have a crank relearn done. Not sure how the 93 was done.

[Nytemare]

Is there an adjustment screw at the end of the cable on the TB??

 

Could be a leak, take some Brake clean and lightly spray around the TB, if you see white smoke coming out the exhaust, you have a leak.

[Jsdirt]

2 feet to stop ..... is the vacuum line to the brake booster hooked up?

[Nytemare]

2 feet to stop ..... is the vacuum line to the brake booster hooked up?

I'm pretty sure he means a foot on the gas and one on the brake to keep the truck running while braking.

[Jsdirt]

Ahhh ... I gotcha. Nothing is ever that simple.

[Nytemare]

Ahhh ... I gotcha. Nothing is ever that simple.

Not for a gear head man....never for a gear head

[Jsdirt]

+1 on that!