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I recently bought an over drive pulley direct from ASP on a Monday and paid extra to for 2nd day delivery because I needed it by Wednesday. Well it never came on Wednesday so I called Lee at ASP on Thursday morning, he said. "I thought we had one one but didn't so I had to make one and it was...

I have been trying to get this UDP to work but it keeps throwing a code (random misfire in the first 1000 rpms) Some guys from another forum suggested swapping the reluctor rings. I did that and it got worse, it started to misfire really bad. I noticed the reluctor ring can move quite a bit and...

Hey guys. I'm trying the UDP again but this time I'm going to install an overdrive alt pulley. It's coming in tomorrow so I put the UDP on today now my car has an intermittent miss. The CEL comes on flashing and it sounds and feels like it's running on 4 cly. then suddenly it runs good again. We...

I finally got the ASP under drive pulley (25%) and put it on and within 10 minutes the check engine light came on. I scanned it and it said there was a random misfire within the first 1000 rpms of running. I sure didn't feel any though. I cleared the code and later that day it came on again with...

I just got a 2004 Mustang with a 3.9 V6 and 5 speed and several times now I've heard a "chirping" sound when I get over 45 mph. It sounds like it's under the dash some where but can't tell for sure. A mechanic said it's probably the idle air control valve, he's had to replace several that did...