Advanced Tech Please Help

[Belkin1323]

I have a 1991 4x4 3VZ-E automatic. I have already replaced the plugs, plug wires, distributor cap, rotor button, air filter, fuel filter, pcv valve, TPS and checked for vacuum leaks. The problem that I am having is at running temperature if I try to start the vehicle it dies, I can apply gas to keep it running. Most of the time in the morning it will run for a little bit. If I come to a stop it dies, I have to keep my foot on the brake and at the same time continue to give it gas. I have also noticed that lately if I am going and just let off of the gas I can hear a relay kick in the dash. I traced the relay down and it is located above the ECU, its labeled circuit opening relay. This problem occurs regardless if the A/C is on or off. As of right now it does not have any stored engine codes before I think it gave me 41 for the TPS, I replaced it with a supposedly good used one with no change so I put the original one back on. I anyone has any ideas please let me know!

[Brian R.]

Sounds like a fuel delivery problem to me. Clean your injectors and check your fuel delivery volume and pressure.

When you're driving, does it miss? or does it run smoothly?

[cmelt14]

Hey Brian R...my truck "misses" when slowly accelerating...what do you think this is? It's fine when I am above 15 mph or so....When I idle...it almost cuts off sometimes..93 4runner with 155k miles.

[Belkin1323]

When I'm driving it runs fine.

[Yalipito]

I had a similar problem that toyota couldn't find, it turned out to be the o2 sensor , you might want to disconnect it and see what happens.
If it runs better replace it, Good luck

[All Engine]

Is timing set correCtly?

[ToyotaTech]

U may have a bad fuel pump after it heats up it loses pressure put a fuel pressure gauge and check that