3 grounds for me as well. Two are combined on the intake manifold grounded at the connection that holds the brace (black bar) and then one on the Block of the engine. I'll ohm them out as well. There is one other thing I stumbled across in the Toyota manual and that's the fuel cut-off signal that occurs when letting off of the gas the ECU will shut off fuel to the injectors @ 1500rpm. Any chance this might be an issue?? Normal driving you'll never know it's there (under load or cruising down the freeway at 70mph... One of these days.... between all of our heads put together.... this WILL get resolved.... I hope!