At lift-off under load, engine starts hunting around 1000rpm in L, 2, D but not in R. Stall speed R approx 2200rpm, in forward gears hunts then bogs down to around 1500rpm. Checked TPS, MAF, no airleaks. Cannot understand why problem appears in forward but not reverse.
Any clues?

 

Found problem after checking every hose - air inlet hose had 1inch split on underside and groove of bellows that opened up under torque reaction in fwd, closed in reverse. Replaced hose and performance now perfect.