Started out as engine stumbling under heavy load (WOT) at lower RPMS, such as going up hills. Just yesterday it started running like this all the time, regardless of load or RPMs.
No CEL. Got fairly new plugs, fuel & air filters (stock). After searching the forums I tried disconnecting the MAF - didn't help. TB is clean. Secondaries are opening alright.
Any suggestions as to what could be causing this?
