97 intrepid shakes when idling

Check your mass air flow sensor (maf). It can be cleaned with brake cleaner or MAF cleaner.

check for ghost codes, the light does not need to be on to have codes stored. I would also check your vacuum lines as these can have strange impacts on a idle. check you pcv valve to make sure it is working proper

vacuum leak, egr valve, crank or cam sensor......

sounds like the crankshaft sensor

Most common culprit is whats called the IAC or idle Air Control Valve. It maintains the vehicles engine idle speed when you are not pressing on the gas pedal. You can eithe clean the valve assembly by removing it from the throttle body so u can access the air passage also, or just replace it with a new one and a new gasket. b eusr eot clean the air pasage too since you have it off. the only other thing is to have a reputable repair facility runa full diagnostic test on the engine systems and see what they say.
I hope this helps.

there was an issue with plate on underside of intake coming loose and causing vacuum leaks and rough idle

yes.it depends where the noise is coming from. start by changing the plugs cap wires and rotor and air filter

its your idle control valve

When was last tune-up, (plugs & wires checked), and fuel filter changed. Good place to start.

I just fixed that vibration problem on my 97 intrepid.I replaced the cv axel which was only 54.00 bucks brand new.No more vibration when excelerating