Thread: Speedometer jumping to over 100 on acceleration

Gas milage according to computer is 22-24.
Now on the way home tonight I have a whole new set of problems....
I stopped and read the codes before hitting the interstate , had 3 codes P0121 throttle position sensor error, P0440 Evap control system malfunction, P0449 Evap control system vent/valve solonoid malfunction...
These are different codes than I have gotten before. I cleared the codes and headed for home (55 mile trip) car was running good, no hesitations or stumbles in stop and go traffic. Then about 1/2 way home, it started acting up... I was running along around 50 mph and when I would try to accelerate the tach would go up to around 5000 rpm and drop back down, but the motor was not reving, it was actually bogging like I had ran out of fuel, thought the motor had died , but was still showing 2000rpm, I worked my way to the shoulder, and the it started pulling again. It did this several times the rest of the way home ( also used over 1/3 tank of gas on the trip) I was able to limp it to my exit, and pulled into gas station to refuel and check the motor.

I was pulling on the vacume lines to make sure they were attached, and the one to a point by the boost bypass valve broke off in my hand. reattached good enough to get home (5 miles)... seemed to run a little better.... but of course the check engine light came on about a mile from home... and it seemed to run even better,,, go figure.

Since the problems seem to be going all over the place,,,, what is the chance the computer could be going out? Would I get these kinds of problems? What sends the MPH signal to the HUD?

I am getting more confused every day with this thing.... I NEED HELP !!!!!

Thanks for all the help I can get.