After my Base 2.4 started giving me fits, I went through a bunch of troubleshooting, checking/cleaning all the grounds, various connectors, fuses, relays, changing the ignition switch, ect., I finally replaced the ECM and it seems to have fixed all of my issues. I purchased my ECM via ebay from a vendor called spareecm for $109. For my symptoms you can check out this thread: Sky runs rough and/or Won't Crank unless i...It's been raining here all morning, finally clearing up so plan on pulling it out checking the voltage and need to jack it up and drop the cover to check the speed sensor. Any idea if it can be checked? I'm assuming either voltage or resistance is how it works but don't now if it can be checked without just swapping it. The Delco sensor is about $100 though , a little much to just guess yet.