No i didn't because i replaced the plugs less than 5,000 and the wires less than 10k it probably wouldn't hurt to replace the fuel filter.. also how would i check if i have a clogged muffler or tailpipe?

 

also air filter is brand new.

 

Take it to a muffler shop, they have equipment to test exhaust for restrictions and blockage.

Did you use Motorcraft plugs and wires?

 

I went with some plugs from autozone that ended up being the wrong ones so i switched them out for oem motorcraft plugs and autozone wires

 

That engine hate cheap parts. Mortcraft parts or BETTER and it hard to find better. Autozone wires are for sure not better. Just get rid of them. To many times guys have come in here with problems only to find they put cheap wires on. It makes a difference! Especially on the wires.

 

Autozone Duracrap wires are exactly that. You can order Motorcraft wires from rockauto.com for about 1/2 the price that the parts stores want for them.

 

I know y'all are saying i should go with motorcraft wires but what about Denso? thanks

 

No..........Motorcraft.

http://www.rockauto.com/catalog/more...161&cc=1354586

$60.79

$96.99 at Autozone, $88.99 at O'Reilly.

 

Ok this is what I'm looking at
Part Price Quantity Total
1999 FORD F-150 4.6L V8 SOHC
Belt Drive : Idler Pulley
DAYCO Part # 89048 {#89048FN} 90mm x 17mm Flat Steel, 37mm wide Drive Belt Idler Pulley
Flag indicates this part fits vehicles sold in the US Market. It does not indicate where the part was made -- manufacturers produce parts in multiple factories worldwide. Flag indicates this part fits vehicles sold in the Canadian Market. It does not indicate where the part was made -- manufacturers produce parts in multiple factories worldwide. Idler Assy. Pulley C
A Pulley Tool can be helpful when replacing this part.
$16.33 $16.33
Belt Drive : Belt
GOODYEAR Part # 4080990 8 Ribs / Effective Length 99" / Outside Length 99.75" Gatorback; Poly-V
Flag indicates this part fits vehicles sold in the US Market. It does not indicate where the part was made -- manufacturers produce parts in multiple factories worldwide. Flag indicates this part fits vehicles sold in the Canadian Market. It does not indicate where the part was made -- manufacturers produce parts in multiple factories worldwide. Accessory Drive; Poly-V; W/AC A
Do you also need a Belt Installation Tool?
$25.79 $25.79
Electrical : Alternator / Generator
USA INDUSTRIES Part # 507198 8 groove pulley included (Only 4 Remaining)
Flag indicates this part fits vehicles sold in the US Market. It does not indicate where the part was made -- manufacturers produce parts in multiple factories worldwide. Flag indicates this part fits vehicles sold in the Canadian Market. It does not indicate where the part was made -- manufacturers produce parts in multiple factories worldwide. w/ Opt Ford 130 Amp B
Do you also need Battery Cables?
$107.79 $107.79
Ignition : Spark Plug Wire
MOTORCRAFT Part # WR5934 {#1821880C2, 2Z10D840AA, F8PE12259LA, F8PZ12259LA}
Flag indicates this part fits vehicles sold in the US Market. It does not indicate where the part was made -- manufacturers produce parts in multiple factories worldwide. Flag indicates this part fits vehicles sold in the Canadian Market. It does not indicate where the part was made -- manufacturers produce parts in multiple factories worldwide. B
Do you also need a Spark Plug Boot Pliers?
$60.79 $60.79
Subtotal $210.70

 

$237 after shipping

 

I wouldn't order an idler or an alternator till you can pin down exactly what is whining with a stethoscope. As I've said, a weak battery can cause an alternator whine, when are you going to get it load tested?

 

I got it tested battery is good.

 

Okay, now use a stethoscope to localize the whine.

 

I've tried and can't seem to localize it.

 

I'd get some help from an experienced mechanic.