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Morning, I have a bt50 that starts then stalls unless I have my foot down, as soon as I take it off it dies, fuel filter has been replaced and fuel pump works, just cuts out doesn't sound like fuel problem? Thanks
check MAP sensor, maybe clogged up.
It's located on top of the inlet manifold near the back.
Also the MAF, and these were known to split the intake tube after the MAF and before the turbo.
Need to also check the fuel rail pressure with a scan tool, the high pressure pump was know to break a spring and cause issues.