It lopes. It's like it's not running on all four. Then as soon as I start driving it, it smooths out and runs fine the rest of the time. Any ideas of what might be the cause?

 

Have you done a compression test?

Is the cold start injector working?

Checked spark plugs?

How are the plug wires?

Distributor look OK? Any obvious issues?

 

Mine was doing that two years ago, it was a crack in the rubber intake boot.

 

Compression should be good because it runs like a bat very soon after startup.

I don't know about the cold start injector.

Plugs are about 3 weeks old.

Wires are pretty old, but it seems like if they were a problem that it would persist, not just right after cold start.

I bet it is an air leak. Now that you mention it I've had that problem more than once and it's very similar. I just don't understand why it would run fine after a minute or two or even immediately if I just start driving. I'll check it out.

I did the battery airbox location swap not long ago and the air conditioning hoses interfere with the intake hose location making it hard to get it to seal.