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Not really sure of the fix. I pulled the air cleaner housing off yesterday morning ( 5/14 ), pulled the choke apart and made sure all the vacuum lines that are on the air cleaner housing were free and clear. She started up and ran Great. Put it all back together and adjusted the idle and air mixture replaced the fuel filter.

Up Date ..... she is running Great.. Fingers crossed she keeps it up. Can’t thank you guys enough for you help!

Got home this morning and pulled the air cleaner housing off, messed with the choke a little. She started up fine and seems to be running like a dream again. On Friday when I parked it the glass sight glass on the carb was a little over half of the glass. This morning it wasn’t even showing in the glass. I’m going to grab another stock fuel filter and then a inline fuel filter to. Really baffling me...

I go on shift tomorrow morning and get off Monday. I’ll check that stuff out then! Thank you for your help!

A little more, new fuel filter, new plugs. The sight glass on the front of the carb is a little bit over half.

Bought my first 1978 Datsun 620 King Cab about a month ago. It was a two owner truck 97,000 miles. It had been parked for about three years prior to me buying it. It is nine stock!! After I bought it I went through it changed all the fluids, drained the fuel tank and rebuilt the Hitachi carb. It ran perfect! Until five days ago. Was driving it and it was a little hot out side and it lost power. It would idle fine but when I wwould put it into gear and try to go it would stall out. My first thought was it just got to hot. Got it home and messed around with it some. Two days later when I got off shift I got home and it stared up and ran perfect! Till this morning. She started up just fine and drove about half a block from my house and she started acting up again. No power, she will start up and run for a little bit then die out. I have searched the internet and went through my shop manual. The accelerator pump is working and haven’t noticed any vacuum leaks. I’m leaning towards a clogged idle jet? It really bums me out.