I have 2 problems on 2 different cars. I'd appreciate advice & info .... maybe costs too. On a 2006 Mazda 3, 2 L, I get a shudder when taking off from a stop. It continues until the car shifts to 3rd gear (automatic tranny). The 2nd problem is on a 2004 Chevy Cavalier. The dash gages are gone crazy. The gas tank registers over full and the speedometer registers about 40 mph over the actual speed. Both problems started at the same time .... HELP!!
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them