I have an odd problem with my 95 LWB. When I punch it down it only revs up to around 4000 RPM then drops off quickly and resumes a bit. While driving under load, especially uphill it loses power. The transmission seems to shift down, but there is no power coming from the engine and RPM drops. If I manually select 1st gear there is only limited power.
Initially I looked at the MAF and disconnected it, which allowed me to drive it up in neutral well over 4000 RPM without a drop off... so I've tried replacing the MAF, but it made no difference. It's an used MAF, but I doubt they both behave in the same exact way. I am starting to wonder if it's the alternator... I have a whine on the radio every now and then. Any other hints where to look next?
Initially I looked at the MAF and disconnected it, which allowed me to drive it up in neutral well over 4000 RPM without a drop off... so I've tried replacing the MAF, but it made no difference. It's an used MAF, but I doubt they both behave in the same exact way. I am starting to wonder if it's the alternator... I have a whine on the radio every now and then. Any other hints where to look next?