Hello to all..... Just to better inform you about my setup and the problems I am having with my 1993 toyota 22RE Pickup...If you have any additional question...Just send me a PM and I'll return with answer ...Or a Question ??? I've rebuilt my engine about a year ago and since then I have had a slight skip in the engine that isn't constant but none the less is audible at idle and the only thing I can do to get it to go away is unplug the TPS...I recently had the Toyota dealership tune the engine and adjust the TPS as well as check out the AFM to make sure they were in Spec. The block is new from toyota and the timing chain set is an LCE double row case and chain...steel backed guides...Added an electric fan kit from flexalite... You'd think that there wouldn,t be much wrong with all that I have done and for the most part it runs good but I know it doesn't run like it used to and hasn't since the rebuild...The toyota mechanic said that he set the idle at 900 rpm and bumped the timing to 6 BTC ...If you ask me he's wrong about that ...it's supposed to be 5 BTC and 750 rpm at idle...Does anyone here think that they may be able to help me locate this skip or hesitation at idle...??? Any help or advice will be greatly appreciated ...THANKS !!!

Did you use a stock camshaft?
My 261c needs the idle set to about 900 rpm. No biggie.

>>>*One cause that matches your description is a weak EGR valve. By the time these engines get ready for a rebuild they often have many thousands of miles of service more than most other designs.

The rebuild should bring the engine back up to specs, then we often see the EGR valve popping open slightly at idle. This can be enough to cause a mild skip or misfire. Since unhooking the TPS seems to stop it, that makes me suspicious of the EGR.

You don't mention if any engine mods were done at rebuild, this can also contribute. Certain types of headers, like the 4 into ones can give a sense and sound of missing when they actually aren't.

A true misfire with show up on an exhaust analyzer instantly. If the emissions spec normal, she isn't missing.

On the timing setting, with modern equipment most dealerships have, they should know where the timing is best set. We are finding 6? baseline and sometimes even 7? as best with our own rebuilds, but not always.

The computer should set the actual timing at speed where it is best anyway, the idle setting is just a baseline beginning point.

One other place to check is the injector pattern, unless there is an electrical concern, skips, misfire, hesitations are typically fuel related. If off a tad, she will skip a beat now and then.. There are other possibles but your tech most likely would have caught the obvious ones.....*EB