​​​​​​​Hi .all of a sudden my Monte Carlo isn't running right.check engine light flashed on.no heat and misfiring.anyone else experience a problem like this?thanks for feedback.

 

Check Engine light flashing is normally mis-fire related. I would recommend having the codes scanned to verify.
Could be a combo of things. Could be aged spark plugs, bad plug wires, failed Ignition Control Module (ICM), bad coil or injector to label some common mis-fire causes. The codes should help narrow it down.