The modifications that I have done to the truck are as follows:
AFE Stage II intake kit
4" exhaust and gauges
Amsoil synthetic oil
Wicked wheel, CCV
mod, HPO Sensor Equilizing Hose
I had a Superchips programmer, but have returned it to stock long ago
I calculated my economy for every tank used since I have bought the truck new. I fill it to the rim and record the mileage at that point and I have noticed a considerable decline in mileage within the last 26 tanks. I have used multiple fuel stations and always add treatment for every tank.
I have never seen this amount of diesel fuel on the ground at the tail pipe. Last year, if I let the truck idle in one spot for 20 minutes or so, the snow would have a little black soot, but this year it looks like someone had a pee by the tail pipe. It smells like unburnt fuel and irritates my eyes after a while.
When I rev the engine up to 2000 rpm and hold it for a few seconds then let off, the truck takes a second to recover to normal idle as it sounds like it ran out of fuel. When driving normally, I notice more black smoke than usual.
The truck has 90,000 miles on it and I have changed the oil every 4000 miles. It has never been over-reved or driven when it hasn't had enough time to warm up. I let it cooldown for 5 to 10 minutes if I have been pulling or using it hard. The Ford guys tell me to keep driving it until something lets go.
That won't be happening. I just want to find what the problem is and correct it.
Thank you for your help