Engine runs rough, ocasionally misfires

[azzar0]

Hello,

I noticed that lately my '98 Boxster started hesitating, especially at high RPM. I couldn't get it over 5500 RPM in 3rd gear, for instance.

I replaced the spark plugs and it has the same issue. If I give it gas it almost chokes and backfires. I don't have the check engine light on. Idle is fine.

I sprayed water on the coil packs while idling to see if one of them has a leak or something - I didn't notice a fluctuation in idle speed...

Any ideas?

Thanks in advance

[Loren]

Have you checked for fault codes? Not all faults turn on the CEL.

This sounds like a MAF issue.

[azzar0]

Thanks Loren!

It seems the MAF sensor was going bad. I replaced spark plugs and coil packs (needed to, I had over 30k miles on the spark plugs and 100k, current milage, on the coil packs) - that made a small difference but did not fix the problem. I ran without the MAF for a couple of days and, for the most part, things were OK. I ordered a new MAF sensor and put it in, and so far (70 miles later) the car runs smooth, there is no hesitation, and no CEL light on.

Thanks again.

[Loren]

:thumbup: