Truck rpm's elevate up and down

Asked by Jul 06, 2017 at 11:33 AM about the 1993 Ford F-150 XLT Extended Cab LB

Question type: Maintenance & Repair

crunk my 93 f150 5.8 motor and it ran fine to begin
with. after about 20 minutes i revved the gas up and
the motor started going up and down with the
rpm's. what could possibly be the problem. When I
drive it, the rpm's elevate also and being at a stop
light when the rpm's elevate, the truck is trying to
take off as I have my foot on the brake what could
be the problem?

Another question, once I get above 35 mph the
truck starts to shake and shutter, but if I let off the
gas it goes on smooth without the increase of gas.
What could be causing the problem? I just putted
new tires all the way around the truck.

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