Shudders and stalls out while in idle

Hello, all!

I have the truck listed above XLT model with 5 speed manual transmission. With some troubles that I'm hoping you guys can help with. One night while driving to work I was on the freeway going 65 mph as I had done many, many times previously and all of a sudden I hear from under the hood a loud, clanking sound and my speed dropping from 65 down to around 40 while in motion. I've already checked and fixed one problem that I identified quickly with the ignition coils (I had to replace them both due to being not only original to the truck but very worn out and putting out hardly any spark, even with new plugs and wires). My next step is to look at the timing set and replace things as needed. The oil was changed a week before and the level was checked prior to starting the engine that night so I know the oil level was correct and at the full mark. I'm hoping you guys can help me make a more informed decision about how to proceed with further time and effort. This truck literally taught me how to drive a standard transmission so I'd like to get her back on the road ASAP.

Thanks a lot and I hope you guys can steer me in the right direction!