Truck runs like junk only when in the throttle

[Christian ojeda]

So my truck is a 93 k2500 with the throttlebody 350, when I but it in drive, if I'm hard on the throttle after a stop sign or pretty much at all it backfires from the exhaust and bogs down to pretty much stalling. Then when I let off the throttle comes back to life, on the freeway it won't go over 60 and after 2000 rpm it starts misfiring and stuttering like its retarding the timing, it won't go over 2500 rpm I've replaced cap rotor plugs and plug wires along with fuel pump and cleaned the throttlebody, and air filter. Pretty lost at this point. It only happens in drive, has short tube headers, true dual exhaust with new cats and o2 sensor (since it only has the one o2 sensor being a 93). Could really use the help

 

[Nad_Yvalhosert]

Fuel starvation at high demand ~= clogged fuel filter.
Your list from the parts cannon doesn't state you changed it.
Change it

 

[Christian ojeda]

Fuel starvation at high demand ~= clogged fuel filter.
Your list from the parts cannon doesn't state you changed it.
Change it

My bad I changed earlier over the summer

 

[Christian ojeda]

I also forgot to mention that in park and neutral it revs just as it should

 

[L31MaxExpress]

Remove and plug the vacuum line from your EGR to test it.

 

[Supercharged111]

I'd check the filter again. Remove it and try blowing through it. Also, how's the ground for the pump? Clean or rusty? Your regulator could have taken a dump as well so watch fuel pressure under load.

 

[thinger2]

Set the base timing to 0 TDC with the dist reference wire disconnected.
It has to be warmed up full temp thermostat open.
Any adjustment to a TBI needs to be done while its hot.
How does it run at hot idle?
You have a classic chevy problem.
post everything you can and Im gonna be all in

 

[Supercharged111]

Set the base timing to 0 TDC with the dist reference wire disconnected.
It has to be warmed up full temp thermostat open.
Any adjustment to a TBI needs to be done while its hot.
How does it run at hot idle?
You have a classic chevy problem.
post everything you can and Im gonna be all in

It's an HEI carb swapped Vortec truck. I don't think 0 is where he should start.

 

[thinger2]

It's an HEI carb swapped Vortec truck. I don't think 0 is where he should start.

Yep, I will go back to reading school,
Once i get my head out of the vise.
Mom always told me I was special.

 

[L31MaxExpress]

It's an HEI carb swapped Vortec truck. I don't think 0 is where he should start.

Where did you read that? OP said it is a 93 TBI.