hi everybody

i have a 94 gjc, V8, 5.2 litres, 160k miles.

whenever i push the gas rather gently and keep my foot on it, the engine will hop with rpm jumping up and down for about 200 rpm. when i take my foot off the gas, it will drop to really very low idle and sometimes die.
when i push the gas harder, everything is just fine. highway driving is no problem at all, the problem seems to occur only in lower rpm, i would say up to 2,000.
idle is ok most of the time, i think it died out in idle only very few times.
i have no check engine light. i had one long before the problem started, which i did not check and now it is gone. this was about 4 weeks prior to the actual problem. could this be somehow related?

any help on this would be really appreciated. i wanna sell the car pretty soon so i don't want to spend too much money on it, but give it away in a good condition.

i already did a throttle body cleaning and just got a fuel injector cleaning and a new catalytic converter. i know that my battery is very old and it has some starting problems, too.
any ideas?

thanks a lot in advance,
sebastian

the old check engine light could be related but I doubt it.
Check the Throttle position Sensor. it could also be the Idle Air Control Valve (Motor).

if u need any info on checking these email me Joe dksob81@hotmail.com

Hi Sebastian,

Yoou may want to check your Idle Air Control Valve,. These sometimes sieze which will result in the symptoms that you indicate. I had similar problems plus rough running at 1650 rpm, the IAC valve solved the problem.