Is fuel pump working properly ?- sounds like you may have a case of fuel starvation under certain situations. Check for pressure being within specs.
SOURCE: When I try to accelerate my car has no power!
There could be a couple of reasons. Yes a tune up would be nice. But my not fix the problem. If you are not losing acceleration on straight away but on hill, then it could be the torqe converter. Also have your MASS airflow sensor checked and air filter.
Also check your fuel pressure at the fuel rail. Get a fuel gauge and look for a port on the fuel rail for a port that looks like the valve on the tire. Screw it in and crank the car. You will have to call the part store to find out what pressure it is supposed to be. If there is low or eratic pressure the its the filter or pump
SOURCE: van will not accelerate on takeoff
NEEDS A THROTTLE POSITION SENSOR MOST LIKELY, THAT HAD SOME PROBLEMS WITH THEM NOT SENDING SIGNAL UNTIL FULL THROTTLE.
Try jacking up car and put on stands as high as poss as you could have air returning when the pedal is returned ,so jack up car pump pedal 4 times fast and hold down bleed l/h/s/first ,do 2 times then the r/h/side and then push down pedal clamp rubber flex hose over back axlewith small G clamp if pedal good do same to FRONT
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