Engine Problems, HELP!!!!

[theGreatDane]

my 1999 ranger has the 4.0 liter v6 and 4 wheel drive. my truck has presented the cylinder 6 misfire code twice in the last 6 months, which I have fixed with a new spark plug in that cylinder. yesterday, however, it started stuttering heavily under load, and all of the sudden had very little power, and started getting very bad fuel economy. the check engine light came on soon thereafter, and when I pulled the codes, it gave me a P1151 and P1152 that said pending. I just replaced the 2 upstream O2 sensors a couple months ago.

I need this fixed soon, as it is my daily driver. What should I do?

Thanks guys.

 

[RonD]

Check and clean MAF sensor
http://www.therangerstation.com/tech_library/CleanMAF.html

it is often the root cause of rich/lean issue
P1151 and P1152 for FORDs can both be set by bad or dirty MAF, also by a vacuum leak, so check vacuum lines as well