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Message: <blockquote data-quote="1loudsuv" data-source="post: 1374586" data-attributes="member: 565138">well i have a 98 ford explorer 2 wheel drive 5.0 engine. and i recently did a tune up change the transmission oil and engine oil ran fine for like a week then it started doing what it was doing before. (also cleaned the mass air flow sensor) well at a light say it idles at 900 rpms then it drops really fast to say 500 rpms and shots up really fast back to 900 or so does it so fast you really got to concetrate to see it do that. whats weird is it does that sometimes and sometimes it can run like an hour and not do it. but another thing that is weird when it starts acting it up. it starts shifting like it im towing a car. transmission is fine. cause i would imagine if it where messing it up it would do it all the time not just when it starts dropping rpms.another thing it does it idles a little rough and sometimes when you try to start it seems to take longer then other times like 2 seconds cranking one time and the next  time 5-6 seconds of cranking and when it starts it starts like at a really low rpm like 300 and shoots up and then goes back down and then it evens out. fuel pressure is fine wires spark plugs coils all new. o 2 sensors read fine on the scanner. and no trbouble codes or check engine like comes up. the only thing the mechanic suggest is the mas air flow sensor but its 150$ and dont want to spend that and have the same thing happenok well im not sure if its the mass air flow sensor that is messed up just wanted to know everyones opinoins. i didnt belive the mechanic that the mass air flow controlled shifts o nteh tranmission but it does like explained here.<a href="http://www.autoshop101.com/forms/h34.pdf" target="_blank">http://www.autoshop101.com/forms/h34.pdf</a></blockquote>

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