Engine Mechanical problem
1991 Honda CRX 4 cyl Front Wheel Drive Manual 273000 miles

Hello, Here is what is happening.
I start my car and it idles high until it heats up. Then when the rpm settles down instead of idleing steadily, it jumps. From 1000 to 2000. When i try opening up the throttle the car sucks air, but seems to be cutting out fuel. Like it is running out . The fuel pump turns on and pumps when i turn they to "on". I do have a bad cap and rotor, and do not know what the condition on the fuel filter is. Please let me know what would cause this to happen. thank you