Rough idle vibration in steering wheel and pulsating noise and vibration

My 97 Riviera sc is idling rough the steering wheel is shaking and I here a pulsating noise . I've already done full tune up and both trans mounts . Could it be an exhaust thing? What do you guys think ? I'm putting a motor mount and two new belts in a few days I only run 93 gas and it only has 73,000 MI it sat for two years . I did oil and supercharger oil and air filter plus other small maintenance.

Any Check Engine Light?

meechie115 wrote:

My 97 Riviera sc is idling rough the steering wheel is shaking and I here a pulsating noise . I've already done full tune up and both trans mounts . Could it be an exhaust thing? What do you guys think ? I'm putting a motor mount and two new belts in a few days I only run 93 gas and it only has 73,000 MI it sat for two years . I did oil and supercharger oil and air filter plus other small maintenance.

What dos "full tune up" mean?

Spark plugs , wires , coil packs , air filter, oil . Haven't done injectors yet but that's not usually included. Spark plugs iridium ac Delco gapped at .60 , blue ngk wires , msd coil packs ( the 5
D576 are sold out everywhere) I have the original coil packs and they are still good by the way . I'll probably get some wires with bigger mm and less resistance probably 8.5 mm msd . But none those should be problem.

Did you use Delco mounts, especially the one in the rear? If you use cheap aftermarket ones they are going to vibrate. I know from personal experience.

Wasn't cheap I don't use anything cheap. I did go store brand on the mounts though duralast . I don't think that's it but obviously idk

That was my problem. The rubber is much harder and translates the vibration through the car.

You remember what brand

West Star or something, got it on RockAuto. As soon as I change to an ACDelco mount it went away. That's why the aftermarket ones are $20 and the AC Delco is like 80

Oh no never go to cheap especially on unknown brands from rock auto . Mine are from AutoZone.... now I'm trying figure out if my clutch is bad or I need flush cus my trans ain't acting right. I'm changing the fluid the filter and gaskets this weekend. Hopefully that'll do it if not I'm changing solenoids and doing a flush . If that don't work the whole thing gets replaced.this what happens when cars sit they fall apart. Still 73000 miles though so imma keep investing

Good luck on your quest.