RPMS surging on acceleration

[Mangus17]

I have a 1995 explorer for with 190k miles, I can't for the life of me figure out what is going on.
1. I'll get a random check engine light but 5 different scanners won't read it

2. Engine starts fine and runs just fine on a cold start but once it warms up my RPMs surge from 2500k to 0 and back up to 2500k and power is almost nil and takes forever to get up to speed.


I have changed the fuel filter, the spark plugs and wires and still no change

 

[seville009]

Throttle body need cleaning, maf need cleaning, new air filter?

Just guesses, but worth checking.

 

[974X4BLACKSPORT]

In order for engine RPM's to increase you need air, and if you are not pressing the accelerator pedal to move the throttle blade in the throttle body and the RPM increases, then air is getting into the engine from somewhere else, this is called a vacuum leak. Start looking for broken or disconnected vacuum hoses first. I understand that the upper intake manifold gaskets can also be a source of vacuum leaks.

 

[swshawaii]

I have a 1995 explorer for with 190k miles, I can't for the life of me figure out what is going on.
1. I'll get a random check engine light but 5 different scanners won't read it.

Loves older explorers need help asap