Comment by HeyLaughingBoy

I had a Toyota pickup that would die randomly, sometimes at highway speeds. Although in those cases, the engine would restart after a second so it felt like you hit a brick wall then kept going. A friend suggested a bad fuel pump. OK, replace the pump and filter (it was cheap and an easy R/R) but no change in behavior.

After a while, I correlated the problem to very high humidity: usually happened during heavy fog or rain. So, it's probably an ignition problem, right? Replace spark plugs. Nope. Distributor cap/rotor. Nope. High performance plug wires. Nope.

Drove me nuts for about two years. Then one day I'm in my garage looking for something and I move my timing light out of the way. Hmmm, didn't think about that...

After two years, problem turned out to be timing slightly out of spec. Fixed in five minutes!