Date registered: Sep 2005
Vehicle: 85' U1300L Holset Turbo VA A/C, 66' Propane 404.1 rock mog, 1975 416 Doka, G500, Volvo C303
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At 6,000ft it will feel fairly anemic. But it should get 55-60MPH on flat ground. You want to look for the nearest Bosch truck shop. They can rebuild and test your injectors and or pump. To identify a missing cylinder you can use an IR gun and look at each exhaust port on the manifold. One will be very cool as compared to the others. That said, if it’s a hard miss you really should feel it beyond a little loss in power.
As an alternate, you can clean your injectors yourself but this disregards setting the pop off pressure and spray pattern. But a good cleaning may improve your spray pattern dramatically and fix your problem. Another option is to buy new nozzles and rebuild the injectors. This still disregards pop off pressure.
Anyways, this stuff is hard to diagnose via internet, but you really should check your fuel filters (all 3 of them) and update your primer pump before you start tearing things apart in search of sudden loss of power. You will likely find a ton of black flakes in your glass filter bowl. This can really kill the power on these things.
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