Need help troubleshooting 1994 Chevy truck performance issues
 

This just started to happen, Stumbles / Stalls / Hesitates / No power / Rough Idle. I replaced the fuel filter and plugs.

Tested the Throttle Position Sensor - Good ground and power (-5v) and ranged good when the peddle was pushed with no jumps in voltage.

Tested the Map Sensor. Passed, with good range through all the vacuum readings with proper voltage.


EGR holds a good vacuum and stalls when open at idle speed. (Replaced 2 years ago)

Total vacuum off the TB is 19 in HG.

That's pretty much all I tested. I did notice something strange, when you disconnect the MAP connector the engine instantly levels out and runs smooth, when you reconnect it dies.

Any help would be appreciated.

Thanks
Brandon

That really need some attention. Although you have given all the information needed, the MAP connector must need a thorough inspection. Check t this video on how to test the MAP connector, . If that doesn't work, you must consult with any http://www.truckersassist.com/services/featured-services/ centers.

Thanks Paul

I actually got that issue fixed, it was an issue with the fuel pump.

I had very low fuel pressure which was the result of a split rubber line at the fuel pump. I ended up replacing the fuel pump, since it was such a bugger to get to.

Here are a few pictures:

http://i957.photobucket.com/albums/a...930_214531.jpg

http://i957.photobucket.com/albums/a...929_155716.jpg