<table border="0" width="100%"><tbody><tr><td valign="top"> Thanking anybody in advance. New to this post but have been looking for some help with my 97 e350 psd. Its an intermittent issue, comes and goes, usually when cold. Can happen under load or not. Idles good, as you rev a bit above idle, loses power, makes a deep throated rumble noise with a bit of hiss, then as I depress the pedal and the revs increase, goes away. While its in this problem, I have a loss of power, no smoke. Thought it might be fuel delivery and changed filter, ran Seafoam and other additives...no improvement. When I listen to that rumble and hiss sound I thought Wastegate but read that this model lacks a wastegate so thinking the sound is an exhaust related sound is wrong. It will run for 1000k without a problem, then return on a cold morning ( sometimes when its freezing, sometimes cold but not freezing) When its running well, it runs great.

1997 E350 ext. w/ raised roof 190k
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