Just picked up a 94 940 Wagon (non turbo) from my mom as a first vehicle for my daughter. It is in nice shape for an Upstate NY car with a good service history.

Driving back to NC last weekend I noticed that the car was bogging slightly as we approached the rolling hills in Virginia. The car had just been in the shop where they'd diagnosed a torn timing belt due to a bolt that worked its way under the timing belt cover. The mechanic thought the belt had slipped a tooth or two.

I was a bit concerned knowing that we had to scale some pretty big grades in Southern Virginia. Sure enough as we started up the hills the car would bog down and even stop running momentarily. We limped it up the mountains with the pedal floored and the tranny downshifting. Once we would crest a hill the car would smooth out and run okay.

We made it home okay and have driven the car for a few days on relatively flat roads. Today I was pulling up toward a stop light on a short hill and felt it bog again. Gas tank is slightly under a half tank. It starting bogging heavily about a mile from home going up a slight grade.

My guess is one or both of the fuel pumps are dying. I don't see that either one has been replaced per my receipts. The main pump (under the driver) does buzz quite loudly. Am I correct here? Air filter and fuel filter were replaced during the recent service. The MAF unit (on top of airbox) was replaced last year.

Car is solid and drives nice. Needs a cat back and some new shocks/struts and it will be perfect. I kinda like driving it (big RWD car) and then getting into my E30...makes the BMW feel like a go cart!

 

Your belt is obviously first thing to look at.
If it has slipped "a tooth or two", you are lucky this is a Volvo, so it got you home. If your E30 slipped a tooth you'd be looking for a new head now.

 

head gasket?

 

Timing belt was replaced prior to the trip so we are good to go there.

As far as head gasket, I see no white smoke from the tailpipe and coolant level is spot on in the overflow.

 

What you have is an engine misfire. No Check Engine Light on? No codes? OK, the fuel pump scenario is possible- a stumble under load, pump not putting out the way it should... Or it could be electric, start with a basic, tune up... Could even be a ground... This is where it gets challenging on these cars... Have to eliminate things one by one...