when i start it cold it surges and pushes black but if you hit the gas for a few seconds it idles good, now the second problem is that if your driving it and hit it over half throttle it bogs hard and doesnt go anyfaster but 1/8 and 1/4 throttle work fine, ive replaces the tps and fuel filter so far havent checked timing but it should be fine.... it doesnt pop or anthing out the tbi let me know any suggestions would be good

its a 90 350 tbi engine

 

Did you check the fuel pressure?

 

no not yet,
there is next to no vaccume at the pcv and checking the vaccume is a joke the pcv isnt sucking and if you rev it doesnt change much theres a noticable sucking if you put your thumb on it but maybe 1-5 psi, also if i unplug the spark timing and advance the dist a lil bit it helps alot no surging and takes off ok but still 1/2 throttle bog but it chirps the tires if you 1/4 throttle it quick off the line but if i plug in the spark timing it idles lower and stalls if i put it in gear let me know!

 

bad MAP sensor? (manifold absolute pressure sensor)
coolant temp sensor?

 

My Coolant Temp. sensor went out a while back and it did similar things. Bottom line it was flooding the engine with WAY too much fuel. Have you noticed a rich condition?

 

does tbi need a egr valve? i noticed mine is pooched just wondering if it needs it

 

pooched? what does that mean? bad? yes it needs it.

 

yes pooched means bad sorry for my "slang" does the egr have anything to do with dieing when its cold

 

i dont think so. id try the coolant temp sensor its like 15 bucks and is easy to change, right by the thermostat.