fernando13e

Hi guys, glad to join this forum, im from Venezuela and i recently got in my hands as a birthday gift from my mother a nice '92 4Runner equipped with a nice 3.0L 6 cyl 3VZ-E engine, unfortunately it had the Check Engine Light on so i did the paper clip method to check for trouble codes stored in the ECU diagnosis system, i read code 21 (Oxy sensor) and the other one was 52 from what i recall (Knock sensor) i got those 2 sensors and had 'em changed i must mention that before i had them replaced the truck felt heavy and didnt had power to pass other cars on the highway.

The difference in power was from night to day (argh you gotta hate what those 2 funky sensors do when they go bad) and of course the CEL was gone, however now i have an annoying hesitation/misfire feel by just slightly making pressure on the throttle pedal, it idles fine and sometimes i hear from the exhaust the engine farting lol, but it gets worse if i just put my foot over the throttle pedal (obviously opening the throttle just a little bit), it hesitates/misfires all along the 1000-4000 RPM's range, any ideas of what could it be? This girl had the spark plugs changed like 5 months ago all along with the spark plug wires and distributor cap and rotor, changed the oil in the engine and in the transmission, there was some vacuum leaks i got rid of (most of them coming from a cracked main intake hose) and all hoses seem connected and tight, i noted i have a leak down the tube of the EGR valve which will i have repaired tomorrow. I hope you can help me solve this problem thanks in advance!