How often do you tune up a 2000 Saturn SL2 ?

you don't have a choke.
Could be the linkage hanging up for sure.
Have it checked by a pro ASAP.
Although it's kinda easy to replace, its easy to go wrong if you don't know what you are doing and safety should always come first.

Blue smoke is usually bad rings. But in the meantime, try changing your oil, see if that helps.

Potentially bad news; when ours started getting quirky, delaying before engaging, it finally lost reverse too.
~$4000 from a Saturn shop or $3000 for independent. After good referrals, we used the independent and the tranny held for 27,000 miles until the engine blew at 56,700 miles; it dropped a rod cap. I 'sold' it to my son for $1. The worst car I have ever owned and my first US car in 35 years- it is also my LAST.

Look at the belts, they are know for squealing on start up.

do tune up and clean throttle body see if that helps

yea it sounds like someone like most wanna be mechanics take a torques screwdriver and run the idle screw up on the throttle body instead of fixzing the real problem also you may want to concider testing and changeing the TPS

sounds like someone might have "rolled" the mileage back and srewed all that up taking the instrument panel out. Possible seen it before.

yes take it back if you are still under warranty.

Problem is in the guage cluster assy.The ODO is mechanical,serviced by replacing guage cluster.

Tune up, and check the PCV line, its notorious for disintegrating.