91' 240 w/ 97 DE motor hesitates extremely bad after warming up

[smokin240]

It started doing this all of a sudden one day when I was sitting at a red light, revving the motor because it was long light, and was just being a moron. Anyway, I pulled into a gas station to ask for directions to where I was going when it started to lose power. At first, I thought it was my imagination, but then the idle dropped. I turned the car off, went inside, asked for directions, and came back out to go to where I was going and it was hesitating incredibly bad, and at one point actually died. So, it would do it so bad to a point where I could barely accelerate at all. The more gas I gave it, the worse it seemed. I had to give it about 1/7 gas and it would get up to speed faster than giving it more gas.

So I noticed the other day that it's not so bad when it's been sitting until about 1 minute later and the car is warmed up. I put the motor in myself and have had issue's like this before. Once was bad grounding, another bad plug wires, and last a dieing battery - all caused hesitation. It's almost like there's no backpressure, and it can't breath or something. Of course that's not it though. Anyone have any suggestions or idea's? Thanks.

Oh, another thing.... the TPS has been falling off alot lately. I have a feeling maybe that not being on tight may be causing issue's. But since then have secured it well and it still has the same problems.

[smokin240]

bump - I replaced the MAFS and TPS. After I put the new TPS its' symptoms eased off alot. I don't have such a hard time accelerating now, and I can drive it without having others honk at me for driving so slow haha. I can give it about 15% throttle before it bogs out badly... then it stops hesitating at higher rpm but is still slow. So any ideas now? Thanks.

[smokin240]

Maybe the ECU is having issue's? I don't smell gas when I drive it so I don't think it's a fuel problem.

[93inHOU]

My '93 240 started hestiting when accelerating and while driving at a steady speed for a couple weeks until one time it did not start. Turned out that the fuel pump failed.

[smokin240]

Ugh, I hope it's not the fuel pump. It actually runs perfect when it's cold. But once the engine warms up it runs like it did before.

[93inHOU]

Then you can probably rule out the fuel pump.

[rogoman]

- Make sure the TPS is adjusted according to spec in the FSM.- Possible dirty fuel filter.- Possible dirty air filter.- Make sure ignition timing is correct.- Make sure fuel pressure is correct.- Possible vacuum leak.