Sorry I don't have tips on the specific trouble codes.
However you CAN look in the brickboard 700/900 FAQ. There's a table of code meanings. Your system is LH2.4
Whenever I look up those codes for one of these, the info I get is:
"The mixture is too rich or too lean, but the computer can't tell you which it is". Which I find moderately helpful, and that's putting it charitably.

JKot is right in that there should be a bit of slack in the throttle cable when it's released.
The manual that you need is Bentleys.
I've seen it available on Amazon and also from fcpgroton.com.

Adjusting the throttle cable where the cable meets the pulley wheel is only to ensure that the throttle plate comes to rest in its maximum closed position when you take your foot off the gas, with a bit of slack in the cable. The throttle position switch (tps) also needs to recognize the closed throttle and should click when that position is reached. If it doesn't, the tps itself is adjustable. It's mounted on the side of the throttle towards the firewall. The TPS has oval holes; you loosen the screws/nuts and slide it a bit to get the adjustment right. Usually if you didn't change it, you won't need to. But of course anything is possible.

With the throttle plate fully closed with your foot off the pedal, idle speed is maintained by the idle air controller which is a servomotor operating an air valve. The computer regulates that valve to allow the needed amount of air to bypass around the closed throttle, to maintain proper idle speed. The computer measures air flow (air mass meter) and also exhaust gas (oxygen sensor) and that way provides the right amount of fuel to match the air. There's really no idle speed adjustment on the '89 and later - the computer is set to allow air flow to keep engine at about 700 rpm or so.



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Sven: '89 245 NA, 951 ECU, expanded air dam, forward belly pan reaches oem belly pan, airbox heater upgraded, E-fan, 205/65-15 at 50 psi, IPD sways, no a/c-p/s belt, E-Codes, amber front corner reflectors, aero front face, quad horns, tach, small clock.