2.0 16V problem

I have a '92 Passat, with teh 9A 2.0 16V engine, CIS-E Motronic...

Yesterday I made an attempt at replacing the head gasket, until I realized I wasn't going to be able to get the lower radiator hose off without cutting the hose clamp, and I didn't have a replacement. I got off the intake manifold, ignition system, fuel injectors and lines, and the intake boots between the throttle body and fuel metering unit.

I put it all back together again and fire it up, and it runs awful. It holds a rough idle at around 900rpm, and I can smell that it's running really rich. I thought maybe the cold start injector was staying on, so I disconnected that, but it still ran rich.

I suspected the ignition system, so I took it out for a road test, and it pulled hard all the way to 7000rpm, so I don't think the ignition system is at fault. The engine has very recent Bosch platinums, a very recent distributor cap, etc...

The only thing I can really think of is that there is an air leak somewhere, and that the Motronic is trying to compensate by adding more fuel to compensate...

Any ideas?

Your timing is out (Valve timing)