2.3L ('83-'97) Irregular idle when warm

[Eduardo.lodela]

Hello, there.

I put some Lucas cleanser on the gas and turned the engine on, letting it that way so the Lucas could work. After 30 minutes idling it became pretty irregular, it was fine the first half an hour... until it didn't. (I don´t think it has anything to do with the cleanser though).

The truck has been parked for years, I just made it work a few weeks ago but I haven't used it regularly since then, just turned it on for a few minutes while checking sensors and so, I guess I haven't encountered this problem before just because I never let it on long enough.

Here is a video of the engine. At some point (second 26) it almost went out:

In this shorter video the idle gets even more irregular:

I checked the MAP, and the Throttle Position Sensor, and they are working ok.

Nevertheless, these two connectors on top of the intake manifold have no hoses in just because I have no idea what's supposed to be there

Edit: I found out there should be a temperature sensor on the manifold:

Perhaps that's the whole issue? Thanks a lot in advance.

 

[franklin2]

Don't panic over anything it does till you run it and get the old gas out and get some new in there. When this new fuel sits around, I do not know what it turns into, but it's nothing like the fuel that comes out of the pump. You can smell it and tell that. The ethanol in the fuel also attracts water. When you get some new fuel in it, you might want to run some HEAT in it also to carry the water out of the bottom of the tank.

 

[Eduardo.lodela]

Thanks! I just checked the oxygen sensor and it's going wild, ha! I'm not sure if I just need to replace it or if it is telling me something's wrong though.

This is a few seconds after I turn the engine on:

This one is after a few minutes on:

...I'm going to make a new thread about this I guess