260E with engine problems?
 

My 89 260E has develope a problem of some sort. Yesterday I drove from Las Vegas to Albuquerque. Running at 75mph most of the way, I filled the tank up at a Chevon in Flagstaff. After about a half hour or so the power started to go down hill, the economy needle went into the red and the rpms increased. On a flate part of the road it seemed fine, going up hill major power lose. Gas milage went from into the hole also. I went to start her up this morning the the eco needle is going from the very begining of the red to the "middle" of the black. Going in reverse the needle jumps into the red and it also does this when I apply the brakes. Could the change in altitude have something to do with this? Anorther thing I have a question about, on the air fliter housing there is a hole in tthe middle of it. In the owner's manual it has a picture of the enigine with nothing in the hole. In a parts book that came with the car it shows a plug in it. Should it have a plug in it? Help this poor Air Force member out.

If it happened after the the gas tank fill up...
 

I would suspect bad gas (there is another thread going with the same subject). You can start with buying gas treatment and then change the fuel filter. That is the cheapest way about it.
Good luck!

Update on the 260E thing
 

Well I went and filled her up put some STP additive in the tank. It started running alittle better after a little trip around town. but the engine still sounded 'funning". I figured I would go and buy a new air filter been about two months since I had her in the shop. I told the onwer that I was going on along trip and not only wanted the oil changed, but would like a really good look at everthhing. had the oil changed, front brake pads replaced and was told "evenything looks good". Well to get back to the air filter story I pulled the old one out and found at least a handfull of dirt around the outsound of the filter. When I pulled the filter out so much dust started to come out the it blocked out the sun. Ok it did not really block out the sun , but it was alot.
The car runs better now, but still goes in to the red on the eco needle if I'm going for 40 mph. Any thoughts? Should I get a new fuel filter too if it does not improve soon?

The "econo" meter is really a vacuum guage. Suggest that you look around for broken or unhooked vacuum connectors.

Breather Hose
 

Well I did have the return line replaced on the breather hose from the valve cover to the air filter housing. I'll take another look today after class. Thanks

Breather Hose
 

Well I did have the return line replaced on the breather hose from the valve cover to the air filter housing. I'll take another look today after class. Thanks