ok,i have never used one of these sites so i hope i am doing this right. I have a c70 2001 convertible volvo. the check engine light came on in november, i drove it like that for 2 months got it fixed; it was an oxygen sensor.. but from waiting for 2 months i inherited a hesitation problem. the mechanic advised that i had been dumping fuel into the engine and to use an engine cleaner in my gas which i did. but to my dismay after a month the hesitation has returned.. only when i am doing around 30mph not highway speed. i have read some of your messages regarding this ecm software upgrade but my car does not fall into the factory/ chassis #. So I am unsure if this applies to me.. But if anyone else has this car and has had this problem it would be a huge weight lifted off my shoulders to know i am not the only one... The car itself freaks me out because it is so quick, I dont want something else to be worried about.
tks MG~