I guess I was not to clear about the vibrating problem. I am sure it is not a fuel problem as I have just replaced the fuel pump and the filter and it does not matter what the fuel level is. When going uphill it is running smooth until it starts to shift into a lower gear, (it is an automatic transmission) then it starts to feel like it is on a VERY rough road and/or the tires are REALLY out of balance . If I press the gas it smooths out. If I can guess when it is going to change gears and time it right I can keep it from happening. By pressing and releasing the gas pedal when I think it is going to happen it does not happen and by doing this I can very often make it all the way up without the problem,.
Hope this will let you better understand my problem.
When I am going up hill I get a bad vibration when the transmission is changing gears.It seems to happen when the transmission is leveling out and stops when you press the gas.If I can tell when it is ready to change I can press the gas and it doesn't happen. If I am lucky I can make it all the way up without a problem. Thanks for any information you can provide.
When I am going up hill my van starts to vibrate, if I press the accelerate it stops until the engine levels out the then it starts again just before shifting to a lower gear. Pressing the gas stops it. It repeats this until I clear the hill. The rest of the time it runs smooth.
I checked the underside and saw that on each side of the isolation bar the bar was shiney like it had been abraised. Could this be my problem.