1994 Mazda 626 Questions

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I already tried jiggling the wheel. The key is in great shape. I can't seem to shift the gear when I press on the brake. Jiggling the key or gear shift doesn't work either. This occured for a while but key would easly turn on second attempt (I switched key sides each time if that effected anything). Some occasions, I simple pulled the key slightly out and stuck it back in to get it started.
car cranks good but wont start
smell gas
94 Mazda 626, 2.0, standard. Installed a used throttle body and idle air control valve, new plugs and wires, o2 sensor, fuel filter, air filter, distributor cap and button. I took apart the IAC and cleaned it. I'm pretty dog gone sure the springs and etc are correct. When I try to start it, it only starts on second and third try and I have to pump the petal several times for 5 seconds plus to get it to idle. It has hesitation when petal is pushed. Biggest thing I noticed was a strong smell of gas/fumes out the tail pipe but after 1 hour of trying to adjust timing by ear the new plugs and o2 sensor is covered in black powdery soot. I also noticed that when I put pressure on the throttle-spring on the throttle body where the cable goes in the opposite direction ( as in thing to close it more the car seems like it will idle better. What could be the problem and what steps do I need to take to start eliminating and checking the problem. Thank you
My car has a problem when in gear. It drops idle every once in awhile to ~500. If this is the BAC please tell me what to do. Thx.
then it starts but some time it does not start
I purchased a salvage vehicle. The engine ran perfect but auto transmission was bad. I took the engine out of the salvage vehicle and installed it in my vehicle( manual Trans). Connected everything up vehicle cranks over but will not start. Act like it about to start but won't. Replaced the fuel pump, 3 distributors( rebuilt from auto zone), fuel filter, changed ECU, hear fuel pump humming when starting, jumped fuel pump for a data connector. There appears to be an electrical pump somewhere in the vehicle but I can not find it. The engine work well in the salvage vehicle. When I installed it in my vehicle I went back to the initial problem. No start.
My Mechnic has replaced egr valve problem still there,he is still testing cleaned thottle body ,checked for vacuum leaks and distributor,and wires,he still can not find problem.The problem comes and goes,anything else to look for thank you
also when it idles up n down it tries to dies and when its not tryin to die it acts like its not in gear? this happened tonight! i was omw home and the car was idlin up n dwn tryin to die then all at one it ran ok but acted like it wasnt in gear at all but when i got into the driveway it finally started pulling again
My Transmission was replaced and after that work my speedometer doesn't rpm needle work all my gauges are woking except my speedometer neddle.
is it in the front or the back
leaks when running
The DPFE (differential pressure feedback EGR) sensor tends to fail. The DPFE sensor monitors function of the EGR valve by measuring pressure changes in the EGR system. Symptoms of a failing DPFE sensor are hesitation or stumbling when driving along with illumination of the Check Engine Light.

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