Rough idle in gear after car wash
Hi I'm new to this forum and I was wondering if you guys could help me out. I have a 1995 Cougar with the 4.6L and 180,000+ miles on it. I ran it through the car wash last week and it has been running rough ever since. It idles smoother in park or neutral but you can tell its still off. When I start it there is a noticeable vibration but that has always been there. It idles in park at 800 rpm with a little surging. As soon as I put it in gear the rpms go way down to 500 and it is erratic, 500-650. It feels like a misfire and shakes the whole car at idle. It feels like it has huge cams in it like an old muscle car. When I give it low to normal throttle, it will sputter and vibrate badly. I can feel it in the seat. If given WOT, it will sputter until about 2500 rpms and then it will take off all the way to redline. But there is still a noticeable loss of power at WOT. At cruising speed on a flat road it seems to be smooth but if i give it any throttle it will sputter. At idle the exhaust sounds like its chugging. Like a puff, puff, puff rhythm and I can smell fuel from the mufflers. There is some white smoke but nothing that isn't normal for Minnesota this time of year. I scanned for codes and it's throwing the P1151 HO2s21 sensor- switches indicates lean.
Things I have done:
New Motorcraft Spark Plugs gapped .054 (Cleaned plug wells and are dry)
New Plug Wires
New PCV valve (15,000 miles)
Intake manifold gasket (15,000)
Air filter (7,000 miles)
Checked resistance on fuel injectors(all .15-.17)
All injectors sound normal
Use fuel injector cleaner every 10,000 miles
Checked resistance on coil packs (each had a bank that was .15~our cars are supposed to be .08?)
Cleaned throttle body
Cleaned battery terminals
Oil and filter changed every 4-5,000 miles (no water in oil)
I'm at a loss of what it could be. I have noticed that the pcv valve hose(the small one on top that makes a U shape) has always whistled when I accelerate but it never was a problem before. Not like this anyway. I am not a mechanic but I do have a lot of tools and can do most jobs. I don't want to take it to the shop because I hate getting screwed and am on a budget. Any suggestions or questions would be greatly appreciated. Thanks.