Good day to all,

I have a project car (4k Carb converted - 4g15 engine) that stall unexpectedly especially when AC is on (not a night-time when it's cool) but sometimes even in the day it may or not stall, nag stall siya mostly sa stop and go traffic but recently sa rektahang takbo. I have done radiator overhaul, cleaned the gas tank, new fuel lines and tubes under the car, new 4k carb, new fuel filters, regular change oil every 5k km as well as oil filters. Battery is at 12.95v not running and 14v+ when running.

New temp sender na rin pero my temp gauge seem busted kasi below 1/4 ng gauge okay ang takbo ko at pag aabot ng mag half dun ako nag-stall before. Now that radiator is leak free, less 1/4 gauge ko so malamig naman kotse pero nag-stall pa rin. And I notice na masyado mainit pa rin ang makina at radiator hoses seem to be bloated at ma-pressure di gaano mapiga at mahawakan dahil sa init.

I have installed new ignition coil, spark plugs are 5,000+ KM old NGK brand and my mechanic said it's still Okay pa naman.

I also found out that the high tension wire running from the coil to the distributor is brittle already so I have installed new set.

Before I installed it the HT wire is very hot so I thought it has something to do w/ the heat loosing electricity. But even after installing the new HT wire it stalled (one time), I'm not sure if it's the heating HT wire (hindi mahawakan) even it's new kaya nag-stall engine or dahil mukhang maluwag since medyo hindi pasok yun mga boots nya sa distributor at coil so what I did is pushed the wire itself further para magshoot sa mga holes saka tinulak ang boots to cover.

The ignition coil is very hot din even after 10 mins above drive in the afternoon, hindi mahawakan at nakakapaso ang init.

It's hard to tell if the engine is overheating kaya nag-stall because the temp at 1/4 nag stall pa rin.

I noticed sparkly sa water ng radiator na parang glitters, I think this is scraped na bakal so I'm planning to change my water pump even though na pag nag rev ako ay nababa naman tubig or may activity naman ang tubig sa radiator pag idle.

My mechanic said it's the cylinder head that needs resurfacing. I need second opinion sa inyo guys if the water pump didn't work out. I don't see oil naman sa tubig so hindi head gasket.

TIA