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Engine is running extremely rich.
22L (liters) is 5.81 US gallons.
Rear of the engine block.
5800 RPM
This is from WikiPedia. General Motors produced a plain pushrod (OHV) straight-4 engine for the J-body compact cars and S-series trucks. Displacement ranged from 1.8 L to 2.2 L with turbocharged 1.8 and 2.0 L versions offered as well. The final version was known as the 2200, and lived on as the Vortec 2200, though the earlier models were never even named. The line was eventually replaced by the Quad-4 and Ecotec Family II in the late 1990s. FriPilot
lr stands for long rifle(uses a bullet) I dont know where you got 22l from
Start at the radiator and follow the upper rad hose to the engine. The hose connects to the thermostat housing. The thermostat is located in this housing.
it could very well be that one or two of you spark plugs are cross threaded, you should check for lots of oil around the top of the plugs, and the other thing it could be is ignition.
Impossible to answer without more information
50-200 usd
Ther is no egr valve on the 2.2 turbo engines. With FI and turbo, there was no need. Some of the earlier carb engines did have egr.
10-1000 USD depending on specifics.