Went out tonight a little run and was comin upto a junction in 3rd no one was comin so i slipt it into 2nd to get a little more power the thing kinda sucked back the way like it didnt wanna go forward then it started to after about 5secs what use think that could be...

s-plugs,a-filter are new and also only put some injection cleaner in the tank 3 months ago so thats all done i was kinda thinking maybe ht leads would cause this..?