Any help you can give will be appreciated. Vehicle is a 94 Dodge Shadow, 4 cylinder TBI. It runs really crappy. The idle is rough enough to shake the engine in its mounts. It smooths out at higher rpms, but the power is really lacking. The exhaust smells rich all the time and it likes to stall during decel. Apparently the symptoms appeared all at once. Here's what we checked so far: -Ignition timing is good, every plug is firing. Removal of any plug wire makes it much worse. -Fuel pressure is good: around 40psi. The manual says 38 or 39 is normal. -Tests with a vacuum gauge seem normal. Specifically, we were looking for a plugged cat, but I'm not sure this test is conclusive. -TPS is about 4500 Ohms total and seems to vary linearly throughout it's range. -I'm not sure on the injector spray pattern. With a timing light, it looks like tiny drops. Anybody have any pictures of a good one? -Not sure about the MAP sensor, but it runs worse without it and removing the vacuum line to it does set the MAP code. -When it's idling and shaking, the stream from the tailpipe is "pulsing" pretty distinctly. Here's some stuff that hasn't been checked: -Valve timing: it could be that the belt slipped a tooth. I know it can be checked by removing the cover and lining up the dots, but I am holding off on that. -Compression: the owner is going to do a compression test to see if there is a bad valve.