I have been having problems with this van I been trying to figure it out but am getting stumped I hooked up a vacuum gauge and it flutters real fast from 18 to 21 hg I am leaning towards a stuck valve and it runs great till you put it under load even putting it in gear I can hear something is wrong It is fuel injected and I can hear the air coming back up through to injector body
What you are seeing on the gauge is usually caused by a valve problem. It's rare that valves get stuck. More likely you have a worn cam lobe, burned valve or a broken valve spring. Check compression with a compression gauge to isolate the cylinder that's affected, then check the travel of that set of valves compared to the others and look at the valve springs to make sure they are intact. If travel and springs are good then you probably have a bad valve. Of course, make sure that the injector and spark plug for that cylinder are working first as a "dead hole" can also give you some fluctuation.
Run some seafoam through the brake booster hose or any vacuume hose that feeds all cylinders. pour a little more than a third of the bottle through it and pour the rest into the gas tank
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