Q: Dies when put in any gear but neutral and park 1995 Chevy Tahoe 5.7 tbi 4x4

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1995 Chevy Tahoe 4x4 5.7 (350 TBI) completely stock. Ok so replaced intake gaskets (it was disgusting under the intake, tons of sludge so cleaned it all out) and valve cover gaskets, removed distributor, got back to tdc unplugged timing control wire and got it all back to timing, sprayed starting fluid and brake cleaner all around to be sure no leaks are present. Ok so the problem is when it starts up it idles like it's calmed, put it in any gear it bogs and want a to die, neutral and park it stays running fine (with pope) runs very poor, no power and soot/black smoke from exhaust, all plugs pulled and were fouled and smelt like fuel, #4 cylinder had slight wet fuel on it, have checked all vacuum hoses, iac, tested tps, blocked egr, new coolant temp sensor, car is coming off tomorrow. So lost with this thing, 4 nights straight until 6am. Please help!

My car has 205000 miles.
My car has an automatic transmission.

First check cylinder compression. If within spec, then scope secondary firing patterns at idle to see if there are any obvious indications of a fuel versus ignition related malfunction and also to determine if all cylinders are involved in the poor operation or perhaps just a few. During that operation, check ignition timing advance function. The results of those initial tests will determine what your next move should be. Although there are a couple key sensors (throttle position, MAF for instance) as well as the possibility of a TBI fault (causing flooding perhaps), get to that once you perform the basic, initial tests. If you want the entire required diagnostic performed by a mechanic, please request an engine loss of power diagnostic. If you request that diagnostic, the certified mechanic will get this resolved for you, right at your location. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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