I have 91 VOLVO 240 sedan. The car was running fine.
I left for India for 4 months, the car was parked
on the street and did not start for that period.
When I started the car after 4 months,it started but
the car does not go more than 30 miles per hour.
And going to hill its very slow no matter how much
i Press the gas.

Your earlier post said, in part: "The gas pedal was hard to press.", which made me think of the K-D cable. If it's stuck, it will affect the pedal/throttle.

Check the 700/900 FAQ (same engine & tran). See --select link-- at top-right above.

Open up the air filter box and make sure no varmits have decided to pack it full of food.

It kind of sounds like it's slipped into limp-home mode (disconnected Air Mass Meter). Maybe try unplugging and replugging the connector a couple times.

Check the timing belt marks on the cam, intermediate and crank shaft. It sounds like the timing belt either slipped a tooth or two or it sheared off a tooth or two. Dan

Automatic transmission? Check your transmission fluid level.
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Andy in St. Paul. '89 244 160K mi, '91 745 209K, '91 745 213K

Automatic transmission Fluid label is between min and max while engine is running idle, what other service for transmission I should perform? The car has only 94,000 miles.