Replaced engine now it does not idle - stalls in gear?

Truck stalls when I put it in gear. I have changed the TPS sensor, injectors, fuel regulator, plugs, wires, cap, rotor, coil, runs/idles strong but when I put into gear it stalls out. Any ideas would be great thanks. 350 V8 5.0L engine.

The IAC was it. I bought it took five minutes to install it and it fired right up and did not stall when I put it in gear. Thanks for the answers!

This site rocks!

This was a friend of mines truck broken down at my house so I did not know this truck well. It had several things wrong with it and has over 200,000 miles on it. I was working with their low budget so I had limited funds available. It needed lots of repairs (fuel injectors, throttle position sensor, fuel pressure regulator, IAC, distributor cap/rotor/plugs/wires, starter, tune up items, etc) all because it was not well maintained. Along with the other things I replaced when I replaced the IAC valve I replaced the fuel pressure regulator at the same time and inside the spring was broken, rusted and corroded. When I replaced them together it helped until operating temperature kicked in but in the end I still had the stalling problem. What wound up really finally fixing it was the coolant temperature sensor. What I read at the library was when the truck first starts it runs on the main computer using those settings, but when it gets to operating temperature it goes off of it. It took me a while of checking everything I had repaired over and over and then I replaced the coolant temperature sensor and it ran good after that. I do not think that part was too expensive either. Like $15.00 to $20.00. Hope all that helps you!

Thankyou!

Hello. I am new to this page and I need some help. My friend has a 1991 Chevrolet Silverado pickup truck V8 c1500 5.7L. She is currently having the same stalling issues. It idles fine when parked but then stalls when put into drive or reverse. The idle drops quickly. Before this issue started happening, she had the truck sitting in her friend's drive way for over a year. About two weeks ago I replaced her battery since it was drained flat and I changed the engine oil. Everything was fine with the truck until it started stalling a week later. Went out to check the truck today and cleaned the throttle body with carburetor cleaner, removed all the nasty carbon from all passages and replaced the IAC valve. It is still stalling in drive. The only way I was able to keep the truck from stalling was by putting a hard plastic piece on a small threaded stud on the throttle body that makes contact with the throttle lever when closed. This is keeping the idle at high and somewhat decent while it is in drive. Now it is only stalling when the steering wheel is turned all the way to the looking position, plus it tends to hesitate when accelerated. Any help or ideas will be helpful and appreciated. Thanks.

I have a 1996 Chevrolet Silverado 5.7 with 184k miles, I have hesitation on first start up when in drive with light acceleration, and also the truck dies when I put
it in reverse. I have replaced the fuel filter, spider injectors, distributor,
cap and rotor, crank and camshaft position sensor, ignition control
module and coil, spark plugs and wires, map sensor, egr valve, mass air
flow, idle air control valve, pcv valve, iat sensor, throttle position sensor,
and an air filter. And yet the truck still hesitates, and now it dies in gear.
It throws code p1351 I have changed all parts known to fail with that
code and yet the truck still runs rough. And on cold start the truck will
only turn on with starting fluid. I'm not sure what's wrong with it, anyone have an idea.

I have a 1989 chevy silverado with a 305, and when it is idleing it trys to die out and then picks back up again, although when I added fuel injector cleaner to the carb it ran fine for a few minutes then did the same thing again? Any help on what the problem could be would be appreciated!

My truck has a 350 with throttle body injection. It was running fine now it won't idle. Could the fuel filter cause this

My Chevy truck is a 1987 model its fuel injected and when I crank it it wont idle and if u come to a comeplete stop it will shutoff what is wrong with it can u help im sick of not knowing what to do

With the a/c on and in gear and I turn the wheel my truck wants to stall it doesnt die but almost does then the rpms will pick back up until the wheel is turned again I have tried everything I think if anyone has some help I would really appreciate it