All, I have several issues. The first issue came with my Check Engine Light coming on and never could find the problem. Next my VSC light came on and Rough Idling when I stop. I've researched and many have changed their oil control valves on their car and it fixed the problem. Well I cleaned mine, and the problem still exists. Also, my VSC doesn't work and at times, my speedometer won't work nor will my RPM gauge. Once I start driving it for about a minute or so, the needles on my speedometer and RPM gauge will shoot up. When I had the codes ran on my car, many codes came up especially misfire. I have a 98 LS400 with 198K miles on it. I'm currently at the point where I disconnected my ECU and my ABS/TRC, & VSC units. I have not purchased anything at the moment. Any help would be greatly appreciated before I begin start spending big bucks in troubleshooting....