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Thanks for thatThe V6 should be rated at 3.5 bar/51 psi but that is without a vacuum source connected to the FPR. At idle with vacuum connected it will read less.
I have cleaned the MAF and changed the fuel filter and changed plugs - checked Omhs reading on the leads, also cleaned the throttle body..Fuel pressure and fuel flow are 2 different things. Pressure may be fine at idle but drop under load if there isn't enough flow.
I'd clean the MAF and probably change the fuel filter for starters.