If I don't let my car warm up long enough and I begin to drive it wants to quit
What is your question?
If I don't let my car warm up long enough and I begin to drive it wants to quit between 40 and 55 miles per hour, also during the day when I start driving right away it idles at 500 to 1000 rpms back and forth as I'm driving for a short time like the governing idle is messed up. What do you think is happening? Thanks for any advice
What makes this problem better or worse?
its worse when the engine is cold
How long has your 1990 Lexus LS400 had this problem?
RepairPal Certified shops can diagnose and repair your 1990 Lexus LS400. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
You will want to start with basics like checking for vacuum leaks, fuel pressure and condition of spark plugs. This could also be a throttle body or tps issue. If you don't work on your own car then use this link to find a good shop near you.
https://repairpal.com/repair-shops
Alex
