Hi I have a 1992 Ram Van with 140000 kilometers and when cruising down the highway around 100 k not really giving much gas it has a stumble feels like water in the fuel, give it gas or just coast it goes away. I have a vacume gage hooked up and this stumble only happens between 10 and 15 inches of vacume above and below runs perfect. Runs smooth under load appreciate any input. Have replaced plugs and wires tested all the engine control sensors cleaned ECM contacts.

 

If you think it's related to vacuum then I would start by replacing the MAP sensor since it is the only vacuum controlled sensor.

 

is there away to test the MAP sensor I had one go on my ford it was very expensive

 

Start here: http://www.autozone.com/autozone/rep...&subtitle=test

 

well my repair was short lived the next day the problem returned not the EGR I guess but everything else seems to work properly think I will take it to a shop and see if they can scope it and find a fault getting annoying.