Did you try out one of these snake oils? Sugar?
http://www.wjjeeps.com/faultcodes.htm#0200 Might clean their
connections, and: http://members.cox.net/wilsond/tb/tb.html
God Bless America, ßill O|||||||O
http://www.billhughes.com/

Marvin Oliver wrote:
>
> check engine codes are
> p0203,p0202, p0204, p0206, p0207, p0208, and p0121
>
> Engine does not seem to be missing so I don't know why the first six codes.
> The rpms will change suddenly when at and idle or just sort of coasting
> (very little gas applied).
>
> How do I check the throttle position sensor? Is it possible that there is a
> common cable/plug for all these codes that could be causing the problem?
>
> tia
> jim