Runs great when warmed up though. It has been losing power gradually. I've replaced all the vacuum lines, turbo hoses, timing belt, plugs, wires, cap, rotor, fuel filter, air filter, etc in an effort to figure it out.

It starts right up, but every couple seconds, a cylinder fails to fire and it "hiccups." It hasn't ever actually died, but it's nerve-wracking. Especially since it's about to snow here in CO.

Seems the relays are OK to me, it's more related to engine temperature. Once it's up to normal operating temp, it purrs along.

Any thoughts about where I should continue troubleshooting? I hate to just throw parts at it, but I need it to run well during the winter. It's hard enough to handle on snow and ice without worrying if it's going to keep running...