Ok so first issue or concern is that when i shift from park to reverse or reverse to drive (not all the time ) i hear a clunking sound liek something is loose or what not its nto the mounts as they were replaced a few months ago and transmission is fine other than that . Also while driving sometimes it doesnt accelerate as it should not a slippage though i can tell if it was slipping and there is no rpm slippage it just doesnt go as fast . i have had a full tune up oil change new valve cover gasket , a new water pump and timing belt done a new fuel pump as well . any ideas help please oh and gas mileage is only around 20mpg not quite what it should be .another issue is i dont believe i have a 17 galloin gas tank as the most i have ever put in is about 12 to 13 gallons .

 

Is there "slack" in the cv joints?

Any stored codes in the TCU/ECM?

 

i dont know that for sure but is that a possibilty . and idk about the codes

 

There is a write up in the Common DIY THreads sticky at the top of this section that will tell you how to get the codes and how to read them.

 

did issue happen after timing belt job?? if so ,,,have the tech recheck the cam timing and the balancer shafts timing