SMELLS LIKE IM RUNNING TO RICH. on 1991 Toyota 4Runner

MY 91 4RUNNER JUST GOT REBUILT BUT EVEN BEFORE THAT IT HAD THE SAME PROBLEM. WHEN ITS ON IT SMELLS TO RICH AND WASTES MORE GAS THEN BEFOR IT GOT REBUILT. ALSO WHEN IM ON THE FREEWAY I WILL HAVE IT ON A STEADY SPEED AND AT RANDOM IT WILL GO FROM 2000 RPM, DOWN SHIFT TWICE AND GO UP TO ALMOST 6000 RPM, THEN SHIFT BACK UP ONE DROP TO ABOUT 4900-5300 RPM AND STAY LIKE THAT FOR ABOUT TWO MINUTES THEN GO BACK TO NORMAL ALL ON ITS OWN. CAN ANYONE HELP I LOVE MY LITTLE 4X4 AND DONT WANT TO GET RIDE OF IT BUT WILL HAVE TO IF I CANT FIX IT DUE TO IT KILLING ME ON GAS..

by in San Bernardino, CA on November 19, 2013
2 answers 1 comment
ANSWER by on November 19, 2013
POSS TIGHT VALVES?
COMMENT by on November 19, 2013
WHAT WOULD BE A SOLUTION FOR THAT?? I DID A LITTLE AT HOME TEST FOR THE CEL CODE AND IT GAVE ME 1271, I LOOKED IT UP AND IT SAID FUEL REGULATOR CIRCUIT MALFUNCTION.
ANSWER by on November 19, 2013
The pinpoint test for your 1271 code will have to be performed,but what I have seen on vane airflow meters is that the door mechanism can come undone from the little clockspring inside of the unit and give similar symptoms because the engine does not know what the load is. if you type in " Toyota vane air flow meter" on you tube there is a video of a guy testing one. These can be repaired,and you'll be able to tell if it's a mechanical failure because the door will not spring back.