My truck runs rough at idle and has since the day I bought it I did a full tuneup on it and nothing still dose it what els can I look for/what can be the cause ??

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2001 Ford ranger xlt
15x8 chrome wheels with 30
2 10" subs 1100 watt amp
3" spindles and I hope soon 33

have you tried cleaning the IAC?

No I have not I will tomorrow tho

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2001 Ford ranger xlt
15x8 chrome wheels with 30
2 10" subs 1100 watt amp
3" spindles and I hope soon 33

Try that, cleaning the MAF sensor and give the fuel system a good scrubbing with either some sea foam or Techron fuel system cleaner. Which ever you use, pour it in before filling the tank and run the tank damn near dry to get the maximum cleaning effect. It will take a full bottle of Techron or 1/3 a bottle of sea foam.

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Sgtsandman's Work in Progress
2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
2019 Ford Ranger STX FX4, Super Crew, 2.3L Ecoboost, 10 speed automatic, 3.73:1 with rear locker, Leer 100XR cap

Ya I would try cleaning the IAC and MAF and also running some seafoam through it.

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f you did not clean the IACV, TB, MAF, PCV, EGR, change fuel filter,add Techron or similiar to tank, etc and disconnect the neg batter terminal for a bit.....then you did not do a "full tuneup"

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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).

I cleans the Iac and the maf runs good now thanks guys

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2001 Ford ranger xlt
15x8 chrome wheels with 30
2 10" subs 1100 watt amp
3" spindles and I hope soon 33