i have a c4 that has not been used in years. i havent changed the fluid but its up to level and doesn't smell burnt. i put the car on the road and it wouldn't even go into second gear. but after a little bit of driving it ended up shifting into 1-2 about after 5 mins of driving so then it looked for 3rd and it wanted to shift but it it just felt like it was in neutral so i kept hitting the throttle about 1/4 way down repeatedly to see if i could get it to engage and it felt like it was banging like it was in third but was just slipping really bad. there was no forward momentum while in 3rd though. filter clogged? needs adjustment?? i hardly know anything about autos its my first one.