I have a 1994 Ford Thunderbird LX. I recently replaced the Mass air flow sensor due to my old one failing. now when i am going up a hill, sometimes (not all the time) my tachometer stays around 1000-1100 ... and i here this grinding noise from the engine.... i push the gas pedal down about an inch and the sound goes away and the rpms go up. sometimes it even does this on a straight away.
does anybody have any ideas of what it could be? ... anyone ever have this problem?
Thanks,
Justin