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If you have a "dead" cylinder the engine will run VERY roughly, especially at idle. It will shake like hell at idle, especially a 4-cyl, where (obviously) a bad cyl. is 25% of the engine. So, does this describe your situation?
More likely is that you have a bad but not dead cylinder, giving some low-speed roughness, and overall lack of power. If that cylinder's compression is up to normal, then fuel and/or spark are really the only other things that can be wrong. Some things to try:
Pull the plugs and compare...what does the bad cylinder's plug look like? If it looks at all different, get a new plug (heck, get a full set for about $6, NGK BP6ES) and install. Remove the bad cyl spark plug wire and swap with a known good one from another engine. Pop off the distributor cap and carefully examine the contacts inside...all look the same? Wiggle and try to firm up all the fuel injector wiring plugs where they connect to the injectors; do this while the engine is running and see if it smooths out.
The object is to check out the things that only affect individual cylinders. Parts like ignition coil and its connections, vacuum lines, fuel filter, fuel pressure regulator and such affect all cylinders and wouldn't cause just one to go south.
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Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)
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