I have a 98 Dodge Avenger 2.0 I recently bought it, It seems to be idleing kind of high around 1000rpm and a slight gas smell The rpms Go up and down some times it has a check engine light also
And when the rpms go up the car Shakes slightly

The 1998 Dodge Avenger still comes in two models, the base and ES, both available with a 2.0-liter, four-cylinder, 140-horsepower engine or the V6, 2.5-liter, 163-horsepower engine. Fuel economy remains around 20/28. The biggest draw of this 2-door coupe is definitely its stylish look. The design combines a sleek sporty exterior with a comfortable interior that fits four.
The major change in the 1998 Avenger is a Sport package available for base models, which basically gives you the V6 engine and creature comforts (air conditioning, power locks and windows) that were standard on the ES. The ABS system is now optional for all models. 1998 also offers more colors for both the interior and exterior.
While it provides an exciting driving experience, Avenger's owners are still hoping for a V6 offered with a 5-speed transmission. Currently the 5-speed is only available with the 4-cylinder, 2.0-liter engine. Minor gripes include a noisy ride and wide turn ratios.
And when the rpms go up the car Shakes slightly
Car starts run ok, go out later starts right up, but put it in gear start to accelerate, and it will stutter or take off like a bat out of hell, any known answer? Thanks
in the cold and sometimes randomly i hear a light knocking noise coming from the engine? it worrys me cuz sometimes it has a nice clean sound and others the knocking noise? anyone else experience anything similar?
Airbags
Dual front airbags
Audio System
Single disc in-Dash CD · AM/FM radio
Brakes
ABS: 4-wheel
Comfort Features
Steering wheel trim: leather
Convenience Features
Multi-function remote: trunk release · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: power
Roof
Moonroof: power
Seats
Front seat type: bucket · Upholstery: cloth
Windows
Front wipers: intermittent
Airbags
Dual front airbags
Audio System
Single disc in-Dash CD · AM/FM radio
Brakes
ABS: 4-wheel
Comfort Features
Steering wheel trim: leather
Convenience Features
Multi-function remote: trunk release · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: power
Roof
Moonroof: power
Seats
Front seat type: bucket · Upholstery: leather
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent