Oil pressure or high temperature (in my opinion) is not going to cause the engine to "stall and kind of jump".
However, to rule-out oil and overall engine temperature, install an 80c or cooler coolant thermostat and fill the engine with an engine oil
that meets the recommendations for your climate.
These engines use a CIS Injection System (correct me if you have a different system), that will cause stalling / jumping when
the fuel pump relay cuts out momentarily. Or if there is a problem with the ignition system (hall sensor in the distributor etc).
I believe you are losing spark or fuel when the engine gets hot. I don't think it is an issue with the oil.
Saturday, August 17th, 2013 AT 10:53 AM