92 toyota camry, 4 cylinder. idles smooth but if you try to rev it up the enigine breakes up miss firing .?

Replace the Ignition coil!

This is a very common problem on the 5SFE engine in your Camry.

NOTE: Check the strength of spark at the spark plugs with a round blade screwdriver - look for a good 1/2 inch (minimum) nice strong blue spark.

The ignition coil is mounted inside the distributor on the 5SFE engine.

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For the most part misfiring is caused by one of three conditions; these include loss of compression, loss of spark and a fuel / air mixture that is out of parameters.

Some potential reasons for loss of compression can include burnt valve(s), blown head gasket or worn or cracked piston rings.

Loss of spark can be due to a weak or failing coil, cracked distributor cap, bad spark plug, or failing ignition module.

An out of parameter fuel / air mixture can be due to a vacuum leak, dirty, leaking EGR valve, low fuel pressure, defective fuel pressure regulator or failing fuel pump.

Check your plug wires. Check for oil down in the holes were the plugs are. Look for signs of fire jumping through the boots.