Howdy & Hesitation on part and full throttle

[mucktuck]

Hey there. Looks like a great forum you have going here.

Sorry to be jumping right in with a request for help but I'm
hoping someone can help me out with a tech issue.

I've got a '98 Pathfinder and have been having some engine trouble. I'll list the symptoms here and if anyone has any idea as to what's causing it i'd appreciate any input you can provide:

1. Hesitation at part or full throttle that almost seems like ignition just cutting out for a second, leading to the engine stuttering and almost cutting out completely at times.

2. The problem is almost non-existent when the engine is cold and gets worse as the engine warms up to the point that it becomes almost undrivable.

3. Not sure if this is related but the lower rad hose stays cold even when the rest of the engine and the rad are hot.

4. Also not sure if this is related but the battery doesn't seem to be charging properly.

Thanks in advance for any help anyone can provide!

[Tech]

MAF In closed loop, does it smoke bad and/or smell when it's rough?

[180sx]

MAF, or alternator is going bad and when the engine is warm it's not getting enough spark when you step on the throttle, But I'd agree with MAF.

Jose

[BigSam82]

I've replaced my MAF and I still have similar problems. When it's cold it runs fine but as soon as it warms up performance gets poor. My engine randomly shuts off...and after I restart it(It starts back up fine every time) I get to 2300 RPMs and can't get past it, it just jolts violently. I have to closely monitor my rpms and accelerate like an old man to make sure I don't hit that magic 2300 which makes my entire vehicle convulse.

When I start it in hot weather it smokes ridiculous for like a minute as well

edit: mines a 2001 SE