i have a really good friend where i used to live. He is known as the volvo doctor. when i got tired of failing every time i talked to him and he said put a tank of premium in it and run the crap out of it. Make sure when you take it in it is as hot as you can get it with out overheating it of course...

ok you have the problem with a 740 or what ever but mine is a 240 gl 1984. could it be same problem

I have a 240 gl automatic that kicks in and out of overdrive while driving at any speed. Whats the problem