problem with 98 isuzu rodeo

[scott2976]

hello, i have a 98 isuzu rodeo that i am having a constant miss when at idle on the middle cyl driver side. i have swapped coil packs with front cyl and when i unplug wire feeding coil pack result is still the same at idle. it doesn't appear to have any power loss when reving engine but has a sulpher smell when at idle. does this sound like an injector problem or a gremlin? thanks

[amigo-2k]

what is the history of the timing belt change? Maybe the belt slipped?

[scott2976]

unsure bought rodeo used with 68k miles on it it now has 89k on it. i wasn't sure if it had timing belts or chain?

[2eyefishclaw]

what kind of spark plugs are in it?????
They are particular about what you put in them, seem to run best with Nippendenso plugs.

[scott2976]

I have Bosch platinum plugs gapped.040 thous. installed 2 months ago. approx 2,500 miles to go.