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Success! Sort of. It definitely starts easier and runs better, but I still have to floor it when it starts or it misfires. But after a few seconds it runs just fine. No more smoke/steam out the back, either. So maybe I still have a vacuum leak somewhere. Oh well.

Actually, I'd had no noticeable lifter noise before my oil change. But AFTER, I was getting all kinds of clatter! It went away after 10 minutes of warming up, but still seems odd that newer, heavier oil would cause MORE lifter noise. Ah well, who knows, maybe it just needs to circulate...

It's been hard to tell if it's better or worse as the temperature was as low as -20, but has been up to 40. Definitely better on warm days. I was starting to lean toward leaky injectors, so I pulled off my upper intake manifold... only to discover coolant in my back two ports! Soooooo I pulled...

Okay, so I'm a tard. I measure across the top and bottom wires of the TPS. Supposed to measure the top and MIDDLE wires. My old TPS was still crappy, but this was definitely not the problem. After replacing it, topping off the oil and coolant, I went for a little drive. It seems to run fine...

Good news, everyone! Changed the oil today, replaced the cardboard-based Fram filter with a shiny new Motorcraft. And fed it a gallon of Delvac 15w40 with half a quart of ATF. It fired right up, no smoke, so I went for a little drive, seemed to run well. But on the way back home, got another...

Ran a bottle of Seafoam through the intake as I'm anticipating having to change the injectors anyway. Seems to run a bit smoother, but does still have problems starting. Even does it when warm now; it'll take about 5 seconds to fire up and then run rather ****ty until you rev it a few times...

Thanks for the ideas, Willy. I just did all my upper and lower intake manifold gaskets, hoping that'd be the problem, but it doesn't seem to have helped. Also replaced the coolant temp sensor yesterday as it was easy and only $12, but that didn't help at all. But do you think having a slight...

I've got a '93 Expo that I'm fixing up. When the engine is cold, it will crank and crank but not want to fire. It reeks of gas, and if I give it full throttle while cranking it, it will backfire a bit into the exhaust. After a few minutes of this, it will fire up but run really rough and I...