98 ML320 Engine Light on and missing

[nisan17]

Hi Group,
For the past two years I've had on and off bouts where my engine light would come on and it would run rough/miss and a few days later the light would go off and the miss would stop. This happens about twice a year. I put maybe 5-10k on it a year. Without me having to spend $100 right away for A dealer diagnostics, does one have any ideas what the problem may be?

Thanks much in advance,

[mbdoc]

With ODB2 anyone with scanner can read code.

Many parts stores do that for FREE.

[nisan17]

Thanks mbdoc.

Again the engine light went off and runs smooth. But will change plugs as it's been four years since the last change.