does the rattle come in under load like climbing a steep hill?
also i recommened everyone try Seafoam. it'll clean out the top end of the engine, mostly the carbon build up on the valves and intake passages. runs about $5 a can and u put it in slowly through the brake booster vacuum line with the engine running. be sure to pour a small amount in at a time so the engine doesnt die.
use 1/3 to 1/2 a can and let the motor off for about 20 minutes. then start it up and hold it to about 1500-2000 rpm until the exhaust doesnt smoke. repeat and proceed to change the oil.
most people noticed a difference with this and some others havent.
make sure to change the oil after and do it where people dont mind being smoked out :)
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93 F-150 XLT 4x4
Modded 300/Bilt E4OD
33x12.50x15 ProComp MTs
15x8 AR Nitros
Cervini's RamAir hood
1988 F350 Custom 4x4
7.3 IDI deezil/5 speed
315/75/16 ProComp Xtreme ATs
16x8 white waggys
04 Sonic Blue Edge SC 4x4
-285/75/16 ProComp ATs
-16x8 ProComp 8089s
-Carrige Works black billet grill
-Black Westin Bullbar
-Various other mods.