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See what the spark plugs look like. Are they black and covered in soot/ Has oil leaked past the valve covers and soaked the plugs and wires/ are they wet and smell like gas? Spark plugs cans tell you a whole lot about your air/fuel mix and ignition. Id make sure to check fuel pressure too. make sure pressure doesn't drop too quickly after you turn off the ...
This is a very known problem of this model (Porsche 924). Your WUR (warm up regulator) is faulty, and it needs to be changed. Read this link for more info: http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/443505-how-do-i-test-if-warm-up-regulator-bad.html
There is a fusible Link that possibly has blown, where the positive battery cable connects to the starter relay, there is a smaller red wire usually has heat shrink on it. replacement fusible link avail at NAPA, Advance auto etc, but could also use a fuse and holder.
Since you already replaced the battery, one of the next reasonable plans of attack would be to see how dirty the air filter is or see if any of the spark plugs have been fouled. If you find the spark plugs or air filter are old, see if replacing them helps your issue. After those steps, I would also investigate the fuel pump and the fuel pump relay if there ...
check your mass air flow sensor(MAF). It monitors the amount of air entering the engine. They often get dirty or simply begin to fail and the ecm can't correctly adjust the air/fuel ratio causing it to go into a limp mode in hopes of protecting the engine. Cleaning the throttle body wouldn't be a terrible idea either
I had a vehicle once that would barely make it up hills and also wouldn't go more than 40 MPH or so. The vehicle was much older (1980's), though. The problem ended up being that 2 of the 4 cylinders weren't working due to the spark plug wires had gotten old and weren't transferring the charge from the plugs to the cylinders. While this is a possibility ...
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