I dont seem to have any power push the accelerater and doesnt want to go

if it didnt do before "insert timing " whatever that is then yeah you messed up something

COMPLETELY SAFE: put up on lift or raise off ground with stands with enough room to get under then have someone do the gear shifting going to speed that causes the thud ,let driver(person in car)tell you when brakes are applied so you're ready then see where noise comes from;could be transmission?????

if you can find away to read the codes you will probably find that it has a bad throttle position sensor

open the hood you should see the throttle cables on the side of the throttle body twist that monster the cables are wrapped around thats your throttle if the motor doesnt rev up its a problem in the throttle body if it does then your throttle cable may be snapped somewhere

I HAD SIMILAR PROBLEM MY 2005 PT SUDDENLY JUST SEEMED TO CHOKE DOWN AND PUSHING ON GAS PEDAL MADE IT WORSE SO I LET UP ON PEDAL AND THEN SLOWLYMPH ACCELERATER BUT I WOULD ONLY GO ABOUT 50 MPH AND THE ENGINE LIGHT CAME ON I CHECKED OIL IT WAS FINE I THEN PUT A CAN OF SEA FOAM IN GAS TANK AND DROVE SLOWLY A WAYS THEN SPEEDED UP IT RAN FINE SEEMED TO BE DIRTY INJECTORS OR FUEL PUMP. I WNT ON HOME THE ENGINE LIGHT STAYED ON THE NEXT MORNING THE ENGINE LIGHT WAS OFF AND IT HAS RUN FINE EVER SINCE

You definitely have a blown headgasket.

injectors may need cleanin or hav pulse problem-get car scanned--chec underhood for any linkage issues or bad hoses causing vacuum leaks--replace other parts of ignition that are worn

Do exhaust system back pressure testing , plugged catalytic converter . Or take to a muffler shop .

This sounds like a clogged fel filter or a cracked air intake hose to the engine.