Car shudders in first till enough speed is gained to change to second. Feels like it wants to go but it wont.

WHEN THE FUEL TEST WAS DONE DID THEY CHECK VOLUME AS WELL AS PRESSURE? YOU CAN HAVE GOOD PRESSURE BUT NOT ENOUGH VOLUME

Sounds like you may have a vacuum leak, Or if it shudders on breaking it could be the disks or rotors are warped. The part where you say it feels like it's not getting enough air is an indication that the engine has a vacuum problem. How does it feel at idle? Trouble shooting is like going to the doctor, the more information the better. If the symptoms happen on cold starts, or is it random. Does it only happen when you break? If you put the gear in neutral and coast and you hit the breaks does it do the same thing? let's try and narrow it down, let me know? GE

clogged catalytic converter perhaps?

lower control arm, rubber bushings worn, common problem, can be intermittent

check wheel bearings as well.

When you replaced your brake pads did you also replace your rotors??? If you haven't replaced them, I can almost guarantee your rotors are warped and need replacing. Anytime you replace brake pads, replace the rotors as well. That's what i reccomend!

This car has both options of auto transmission plus manual gear **** so the only reason it can shudder when the clutch is not fully released and thus takes some time, that's when it shudders, but on accelerating this will not happen cos the centripetal clutch has enough torque such that the clutch is pressed hard to the cam & therefore no shuddering. On cruising speed the probability of clutch slipping making the car shudder. Thus changing the clutch assembly ought eliminate this problem....sodeep

This sounds like there is something worn in the steering. If it is a rack & Pinion steering the rack could be worn out. It could also be the CV joints to the front hubs. Regardless it does not sound safe. Take it to an independent mechanic, NOT THE DEALER, and have it inspected. There typically is not charge to inspect/identify the problem.

check fuel filter for water, that means you have water in your tank or it could be just blocked wiht dirt

Hi there,
It could be your power steering pump. Have you put fluid in your pump lately? Try that. I hope this helps you. Let me know. Have a great day.~MWD