Loping at Idle

Hi hope you all can help! My truck runs fine but it just started loping at idle and using a ton of gas. Here are the codes I got.....

P0102 - MAF or VAF A circuit low input
P0171 - Systen too lean (bank 1)
P0174 - System too lean (bank 2)
P0300 - Random/multiple cylinder misfire detected (I don't believe this one).
P1504 - Idle air control circuit

Like I said the truck runs fine except it is burning gas bad and lopes at idle.

So what do you guys think?

i don't no what engine you got in there but the first thing i'd do is replace the 0-2 sensor thats not on your list but iac is.why don't you think its not iac? but really need to know engine size and make.

i don't no what engine you got in there but the first thing i'd do is replace the 0-2 sensor thats not on your list but iac is.why don't you think its not iac? but really need to know engine size and make.

Oops sorry!

It is an 01 Ford Ranger 4.0L V6 4x4

I have had a few people tell me to replace the MAF due to the gas usage. I did a test of the IAC, unplugged it while running and the RPM's started to drop, I was told that means it is good.

So turned out to be the MAF. That cleared up 4 out of 5 codes. Last code left is P0300.

So what can it be now? Plugs? Coil? ???

yes thats what i say when one sensor goe's bad it shows another sensor bad thats the way they get you in a shop and say all these sensors are bad.the computer throws them another signal thats bad.but glad to hear you figured it out.

Well it is oonly 3/4 fixed, it is still idling rough but no more loping. It is showing a P0300 which is a misfire.

I will start with replacing the plugs tomorrow, any other ideas?

you mise well put new spark plug wires on it if they haven't been changed for awile.look under hood and see if you see any wire cross firing in there.now that don't mean there good they can also break down inside. but look if you can.