How can I tell if it's the distributor or a clogged catalytic converter?
What is your question?
I have a this same vehicle with the 3.3 V6, automatic, King Cab, A/C. I've changed the distributor in 2007 and then again last Monday (Feb. 2018). By Wends. the same symptoms came back. Took truck back to mechanic, changed distributor with a better band yesterday. Mechanic let the truck run for an hour, then test drove it 20 mins. I got the truck back and after 40 miles the same "die out" symptoms returned. I'm still getting a Knock Sensor fault code which the mechanic said is not related to the die-out symptoms.
What makes this problem better or worse?
When it gets warmed up.
How long has your 1999 Nissan Frontier had this problem?
RepairPal Certified shops can diagnose and repair your 1999 Nissan Frontier. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
I know for a FACT these distributors give a BUNCH of trouble!
The usually symptoms are ; Engine runs great while cold - can stand there and watch engine idle get rougher as engine gets warmer - stalling is also a possibility.
This is just a suggestion related to problem I have had in the shop with the 3.3L.
Now, I can't say what you particular issue is without personally doing the *hands-on* testing.
