I just picked up a 2010 x748 with hfwd. Tractor works very well however when it gets warm when going forward the forward pedal pulses at my foot and the tractor jerks. If I floor it I feel very little but if I try to crawl and slowly increase speed it pulses quite hard, the tractor bounces forward. Reverse no issues and I have tried a few times to purge the air out of the system with no changes in results. I have done a full hydraulic flush. Anyone have any idea what could be the issue or where to start? Thanks for any help.