My 1999 110Bhp 73k miles tripped out again this morning. It's fine thrashing it up through the gears but come to an incline and it fails. 2000-2500 rpm, 40-50 mph in 4th gear, full throttle and it pulls fine for about 10 seconds and then there is a loss of power. Switch off the engine and restart and normal power is restored. MAF was replaced 3 years ago so should be still OK. Is it likely to be the turbo at fault?