This also occasionally happens on the freeway after I have reeched freeway speed. I will be driving for a while and hear this light thump then my rpms go from 2000, about where they r supposed to be, and go up to about 2500 rpms like it shifts down to the next lowest gear or something. Once again my check engine light comes on for a while and it goes off soon after.
I have hooked it up to a scanner and so far all I t has told me is that my oxygen sensor is reading lean, and insufficient rpm change during system test.
Please help if u know anything. Thank u so much.
have the same problem?
Friday, January 29th, 2010 AT 11:08 PM