89 190E 2.6 intermittent limp mode

[long-gone]

My Daughter's '89 190E 2.6 (76K) intermittently goes into limp mode. At least that's what it sounds like she's describing. I've seen at least one post that asserted these models don't have a limp mode.
She'll be driving along and the car will suddenly lose power for about 15-30 seconds or so and then return to normal. It may do it once or several times over a few miles. It doesn't do it everyday, maybe once or twice every week or two. It normally runs exceptionally well and strong, and it has never done it for me when I go to check it out.
The last time, it lasted for several miles and until she got to a friends house and shut it off (which seems to demonstrate a worsening of the problem). When it occurred she couldn't get the car to go over 20 mph. She tried flooring it, as if to get it downshift for more power (I told her she wasn't going fast enough for it to downshift) but it had no affect on the condition. Interestingly she said when she gave it gas the rpms would go way up but the car wouldn't go any faster. I thought it may be the tranny when she told me that, but when I arrived to test it it ran fine. Strong and smooth and shifting perfectly. T-fluid level and color is fine so I highly doubt it's the tranny.
It doesn't stall or even threaten to stall, it just won't go, like a prolonged hesitation, so I'm back to thinking limp mode.
I have an OVP to swap, and I'll test the temp sensor when I have chance to look it over this weekend.
Sound familiar to anyone? Will the EZL trigger a limp mode if the crank sensor posts a bad signal? Any other suggestions?