Do you know the codes or are you asking for help pulling the codes? If you know the codes, go here to find out what they mean. If you need to pull the codes, most auto parts stores will pull the codes for you for free.
Sounds like you need to check the O2 sensor and the MAP sensor. According to this site, 33 = Air conditioning clutch relay circuit open or shorted (may be in the wide-open-throttle cutoff circuit). This could also be thrown if there is no A/C in the car. 34 (1987-1991) speed control shorted or open. 51 Oxygen sensor stuck at lean position (Bob Lincoln wrote: may be tripped by a bad MAP sensor system causing a rich condition, and the O2 sensor trying to compensate. The O2 sensor may still be good. The MAP assembly consists of two pieces, the valve and the vacuum transducer (round plastic unit with cylinder on top and both electrical and vacuum connections) - If you get hot rough idle and stalling, especially on deceleration, accompanied by flooded engine and difficulty restarting, that can be a bad MAP sensor causing the O2 sensor to try to compensate. If you get poor cold driveability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor. [Webmaster note: MAP sensors seem to die regularly.] 55 End of codes.
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What are the codes
did you rte this or do i need to look in the site?
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SOURCE: Replacing the heater core on a '88 Plymouth Sundance?
Behind the dash. You will have to pull the whole dash assembly. It looks like a little radiator.
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The codes coming up are 33, 34, 51 & 55 on the '88 Sundance. It's my daughter's car and runs good when the throttle is down, but as soon as you release pressure on the throttle, it sputters and hesitates, although it keeps running. HELPPPP!!! Frustrating.
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