posted 07-14-2001 09:51 AM ET (US)
It sounds like one or more of the plugs are not firing. If the whole ignition system were out, of course, it would not run. One cylinder not running will give a rough idle and limited power.Check the actual connection to the plugs in the rubber plug boot. You may not have a good connection. The rough landing may have loosened a plug connection and perhaps you have not re-seated it all the way onto the top of the plug.
If there are separate coils/drivers for each plug, one of those may be loose or may be damaged.
Put your timing light pick up on each plug wire individually and verify that cyclinder is firing.
Let us know what you find. Gathering collective experience in trouble shooting engines helps all of us.
--jimh