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Catalytic converter could possibly be clogged. Are you getting any sulfer smell? especially when going up hills. Also if this is a vortec motor ( says VORTEC across the top of engine) they were famous for have the injector module leak in the intake.
It sounds like the fuel pressure regulator diaphragm is broken, causing fuel to flood the engine when first started, then clear up and run fine.This is a common problem. let the vehicle sit for a few hours , then pulling off the vacuum hose to the regulator. Fuel may dribble out of the hose indicating bad regulator.You can also smell the end of the hose for a raw gas smell.
CAR BOGS DOWN COULD BE FAULTY TPS SENSOR, CLOGGED FUEL INJECTORS AND CLOGGED FUEL FILTER, STOPPED UP AIR FILTER, FAULTY MASS AIR FLOW SENSOR.BEST BET IS TO HAVE CAR CODE SCAN MANY THINGS WILL CAUSE ENGINE BOG DOWN.HAVE VECHICLE CODE SCAN AND SEE IF YOU HAVE ANY FAULT CODES.MAKE CHECK TRANSMISSION FLUID LEVEL.ENGINE NEED TRANSMISSION TO FOR TORQUE AND POWER TO PUT CAR IN MOTION IF TRANSMISSION NOT WORKING OKAY IT WILL PULL DOWN ENGINE POWER.
Not sure about the idle speed thing, but it sounds like one or more injectors is dripping (not fully closing). That would cause the smoking/gas smell. You should take them out and have a specialized shop like RC Engineering clean them. Might also be the idle issue.
if its manual sounds like your clutch could be slipping does car smell of burt clutch?
check cluth adjustment
may need new clutch
do stall test with hand brake on, foot (heel-toe) on brake and accel pedal to about 2000rpm then let out clutch and car should stall if engine revs go down and engine still runs but you can rev causing slip and you will now smell what slipping burnt clutch is replace it.
if its auto check trans oil level and what does it look like red-good
darker red to black-bad often smells burnt also possibly new trans required.
The computer will not allow the car to full rev in park to protect the engine. Likewise there is a rev limiter when in drive which will shut down injectors at high engine speeds usually around 5000 RPM or so.