So to put it nice and simple just bought the truck, its a 2004 Edge 3.0 4X2 with 120K on it, I drove it 3500 miles in the first week. the truck handled the roads pretty well but it had trouble keeping up with highway speed sometimes especially when there was a headwind and going up some steeper slopes. I do my own work and im trying to get another 20-30 hp out of the truck and im looking for a relatively inexpensive way to get that done.

 

Welcome to the forum

Check throttle cable, these like to stretch so you no longer get full throttle with gas pedal down to the floor
Put something heavy on the gas pedal, or a stick pushing it down held against seat

Open the hood and see if you can open throttle more, if so Google: Ranger throttle cable mod
Simple under a $1 fix

The 3.0l Vulcan engine is a designed HIGH RPM engine, makes best power at 3,500rpm, most engines do that at 2,500rpm, so you HAVE TO keep RPMs high to get best power, thats the design

Test engine vacuum, that can tell you if its getting worn out, compression is getting lower, expected is 18-21" at idle

Modifications to gain power on the 3.0l Vulcan are few and expensive
The cheaper one is switching to electric cooling fan, gain is about 2-3hp, also better MPG

Just FYI all fuel injected Rangers came with CAI(cold air intake) with 200% air flow
They also have tuned exhaust(headers) set for mid-range RPMs, in this case 3,500rpms

Morana racing has some upgrades, seen here: Tom Morana Racing Engines

 

The 3.0 is a dog when thinking about power.... that model year had poor valve seats, did the PO replace the heads if not you might be heading for that....soon.... if that is your problem dont get rebuilt heads they are junk, go with new ones........... I have been through this repair, check my posts...