00 windstar misfires need help!!!

got a 2000 windstar with 166k on her. i done some work to her already. i have replaced the pcv valve, spark plugs, plug wires, coil pack, cleaed the iac out, cleand the maf sensor, cleaned the egr ports, replaced the gaskets and isolater bolts, replaced the fuel filter, i dont know wat else to do the van misfires and when i drive down the road about 2000 rpm the van shackes cause of the misfire, and it slightly hesitate to get up to speed. it idles fine. i been reading on here trying to fig out wat it might be but i dnt want to waist nemore money on it. when the egr ports where clogged it showed 1 and 5 where misfiring so yea. i need someones help.

Try getting some Berryman's B-12 Chemtool in the metal can.
AutoZone and some other auto part stores sell it.
My mechanic turned me on to it when MANY other products did not clean my fuel injectors.
I have several times come up with a miss that ended up being crud built up over the spray end of the fuel injector(s).
The Berryman's is one of the cheapest products......and easy.....just add to the fuel tank.
You may need to add 2 cans to treat your 20 or 25 (optional) fuel tank.
I had one time that I needed to treat 3 tanks of fuel to clean them up.
Now, I add a can about 4 times a year to prevent the issue.

Several times, I have chased my tail trying to figure out a miss........ending up with the Berryman's solving the issue.

would a broken valve spring cause it to miss fire the engine has a lil knock in it the mechanice that i took the winstar to siad he had anoher van come in with the same symtems and it was a valve spring he is charging me 150 for diagnostics test and replace the vlve spring we will see tommorrow if its it he siad it will be done so ill keep you posted

Hey Toolman, Look under the post: "Misfire on cylinder 1." It's a 2 page post. A guy had a valve spring problem...

Looking forward to hearing of your fix!