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Too much gas. Maybe the fuel pressure regulator has failed. Pull off the vacuum hose to the regulator-if any evidence of gas in the vacuum line, regulator is bad-diaphragm has ruptured and letting in extra gas to engine through the vacuum line.
If that is good, no gas in vacuum line, have the fuel pressure checked. Still possible the regulator is not right.
Watch the pattern of gas out the bottom of injectors while the engine is cranked. Should see a fine mist cone pattern spraying out from the injectors. If it is just dripping, injectors may be clogged.
It could be low fuel pressure from a weak pump. A fuel pressure test would find out. When the engine is cold, the computer keeps the injectors open longer-a cold engine needs more gas to run than a warm one. When at normal operating temperature, the computer matches the gas to the incoming air. If you have low fuel pressure against the injectors, that is when you would notice the hesitation. A possibility anyway. If fuel pressure is good, check for trouble codes. A sensor may be sending the wrong information. Could be the mass air flow sensor-the one that tells the computer how much air is coming in so it can match the right amount of gas for it-through the injector on-time. There it is, your injector pulse width is too narrow. Causes lean running, stumbling, hesitation. Another possibility. Check for codes first. If not air or gas related (is your air filter clean? And the gas filter been changed in the last 2 or 3 years?), and no codes, and fuel pressure is good, you may have to keep looking for an electrical fault. If it runs good when cold, doesn't seem likely to be a mechanical fault.
Hi, I believe you hit the nail on the head. Black stuff in the filter Meaning that there is something in the tank. You have to drop the tank and clean it out. Good luck.
Clean fuel, clean filters, clean pvc, and since its a '99 try an emissions flush, your e-vap canister is most likely cloggeg, or even a faulty egr valve,
Put an injector noid light at the injector plug terminals to see if your getting a signal from the PCM(computer).If not try to find a computer from the same vehicle that works and swap it into yours to check.A PCM swap will take about 15minutes.
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