Intermittent Slightly Sluggish Start 1.8T

[Lovel]

Very unusually for my runabout, these last few weeks I have been experiencing a sluggish start before the engine catches when the engine is cold. This occurs in very low outside temp and when relatively warm, perhaps 1 in 6 start ups are sluggish.

The engine runs perfectly right up to the redline once running. Excellent fuel pressure reading (not backed off or extruded elastomer at the filter housing) at shraeder valve and before the inlet manifold.

Initially I thought it was the fuel pump relay, due to my perceived lack of prime when turning the engine to ignition switch to position II, but it turns out I was getting prime. I changed the fuel pump relay out as a matter of course but this has made no perceivable difference.

I have not run T4 diagnostics yet, but now I am focusing on the cam or crank sensor. Anybody have any comments on this scenario?