ENGINE POWER UPGRADES 3.0 straight six? Any ideas?

I have a 1991 Extended cab 2wd Ford Ranger. Has a Straight six in it I and all 100% stock engine and truck (except stereo but that does not affect mechanical performance.) i bought it then got deployed to Afghanistan and will be coming home soon to get to know it better and start doing work restoring and improving/customizing. Would love to get some more power to the wheels. Anybody have any tips and specific things i can do to increase the power? I am not a mechanic but would love to learn from building this truck up. Will try to post pics of progress once i get back home. Any help would be much appreciated. Thank you.

uhm. no it doesnt have a straight six if its a 3.0.... and factory....

yikes.

I’ve got a 2006 3.0 and I’ve put a jet performance MAF sensor & I got an ACCEL supertuner. I noticed an immediate difference. I’m about to get the jet performance module for the ECU. The truck has a lot more power and get up & go than before. I’d be interested in hearing from someone with both the jet MAF & Performance Module.