1990 Oldsmobile Ninety-Eight V6-3800 3.8L TPS Specifications

You have to get a repair manual at PepBoys, Oreilly auto parts..

have you checked the connections? Make sure they are fully secured.

Any decent auto wrecker should have a dozen of those, or ebay.

Replace the crank pulley aka. balancer, they fall apart and knock.

if you are not experienced mech. maybe you should take it to one

CLICK on the following LINK.
It has the Belt Diagrams you will need.
If you would: Before Clicking: Let me know if this helped you, or if you have any additional information or questions. Feel Free to contact me at FixYa.com!

http://www.2carpros.com/car_repair_information/year/1994/make/oldsmobile/model/ninety-eight/1994_oldsmobile_ninety-eight_drive_belt_routing_diagram.htm

It should tell you on the driver door or the panel by the door. Along with Tire information. My guess would be between 4k and 5k lbs. If you can't find it then google vehicle weight. I think the website is autospecs.com or vehiclespecs.com. There are sites that have that info.

Check egr valve, check pvc valve, check head gasket, check air filter, timing timing out of adjustment, burned valves or leaking, cam shafts could be worn, check fuel enjectors.

I have the same problem did you ever figure it out.

that happened to me and I solved the problem by replacing the computer. It cost me $40.00 out of a junk yard and it has been running perfect ever since.