Is the check engine light on also? it sounds like the idle air control valve is bad. this controls the idle of the vehicle. when it is stuck open it causes too much air into the engine and causes it to rev. when it gets to a set rpm, the pcm cuts fuel. then it turns the fuel back on, then the engine revs, then it cuts fuel........code p0505 will prob be set
This could be anything from a timing issue (not good nor cheap) clogged injectors or a vacuum leak
SOURCE: When in park my 1991
You will need to replace the (IAC) idle air control valve. Click on the link below to view tha part you will need:
http://cgi.ebay.com/ebaymotors/HONDA-ACCORD-90-93-Fast-Idle-Air-Control-Valve-IACV-_W0QQcmdZViewItemQQfitsZYearQ3a1991Q7cMakeQ3aHondaQ7cModelQ3aAccordQQhashZitem2eb0911ea2QQitemZ200530796194QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories
The idle speed in your car is controlled by a computer (known as the PCM), the computer controls a valve called the Air Bypass Valve, this valve and the throttle valve get full of sludge from fuel vapors and combustion "blow back", this causes the valve to stick or move slowly, this in turn causes surging (speed goes up and down) in the idle speed of the engine, it is the most common reason for idle surge on any fuel injected gas engine up to about 2004 when car makers starting using electronic throttle control. To clean the idle speed control valve and the throttle valve do the following.
To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professiona
But check the Power Steering Pressure sensor wire first. The wires are known to break at the sensor harness and cause idle problem. if it's broken then repair it first. Look from under car view.
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