Stumble and or no start....

[rlp]

Hey all. This 03 QX4 of mine has been hard to start as of late. Now I have only had it couple of months and have had to start using F#(&$%)&#ng Ethanol but heres the thing.

When sits, as can for week or more, wont fire at all sometimes. Will turn over and could kill battery if wanted but no fire. Noticed that security light was still on so used key to unlock/disengage system and fire right up'.

But; stopped and came out of store twice today and would hardly start. First acted as if fuel starved and stumbled trying to catch idle. Like an old chevy with carb problems or a bad fuel filter stumble, if know what I mean.

Second time stumbled and stalled. Cranked several times and pumped fuel and started just fine then. Dont know how relevant pumping pedal is as seems to have no affect, when starting or about to stall when stumbling.

Anyway.............. could we be talking fuel delivery or spark or is there another issue that might be common here? O2? etc... Major tune up in order seems but never had any ride of this kind go this route. Heck.. 92 M30 justs fire up and always has.

Any help greatly appreciated..

RP