01 Tundra P0100, P0110, & P0300 Codes

Hi, I am new to this group. My 2001Tundra Limited 4.7L 230K miles, started to run a little rough when I left work. Check engine light came on after 10-15 miles. Found codes p0100, p0110, & p0300. I did all the basics - visual, cleaned MAF, blew out air filter, verify all connections. Installed new MAF sensor. Engine actually runs worse. Check engine light flashes - goes off, then flashes again. I did clear codes prior to starting with new sensor. Now getting multiple misfire codes & engine running very rough. I also disconnected the battery for 15-20 mins. My cheap scanner is now saying "no codes". Any thoughts?

 

0300 is random misfire. I'd check/install new plugs and wires. If you're handy you can also test the coils first, could be one or more of them too. Not sure if this engine has an idle air control, if it does it needs cleaning too. Luck.

 

Since you disconnected the battery I would start with cleaning the throttle body.

 

Thanks for the responses. Plugs are about a year old, no wires (just boots). When I got home yesterday to make more checks, truck was running fine - no CEL, no codes. Cleaned throttle body. Test drove around the block fine. Ran errand a little later - started to run rough @ idle & check engine light came back on. I will check codes when I get home today. Read online how to relearn idle on Toyota's - operating temp, turn key on then turn off. Turn on & start engine, hold brake & put in drive & hold. Did this a couple times - didn't do anything. Checking on idle air control.

 

Might be plugs or could messing up. Have you pulled any plugs yet? Make sure you don't have a loose spark plug as well.

 

Checked plugs - all look good. I could not find the resistance specs on the coils. They all actually look like original coils. I did ohm the coils, they were all very close. Going to put the Snap-On Solus to work this evening & dig deeper. By the way, truck is running good for now & check engine light is on. My cheap code reader says "No Codes".